Costco Wholesale (COST)

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

Costco Wholesale Corporation:

We have audited the accompanying consolidated balance sheets of Costco Wholesale Corporation and subsidiaries as of August 30, 2009 and August 31, 2008 and the related consolidated statements of income, stockholders’ equity and comprehensive income and cash flows for each of the 52-week periods ended August 30, 2009, August 31, 2008 and September 2, 2007. These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the consolidated financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall consolidated financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the consolidated financial position of Costco Wholesale Corporation and subsidiaries as of August 30, 2009 and August, 31, 2008, and the results of their operations and their cash flows for the 52-week periods ended August 30, 2009, August 31, 2008 and September 2, 2007, in conformity with U.S. generally accepted accounting principles.

Effective September 3, 2007, the beginning of the Company’s fiscal year ended August 31, 2008, the Company adopted Financial Accounting Standards Board Interpretation No. 48, Accounting for Uncertainty in Income Taxes, an Interpretation of FASB Statement No. 109.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company’s internal control over financial reporting as of August 30, 2009, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), and our report dated October 16, 2009 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.

/s/ KPMG LLP

Seattle, Washington

October 16, 2009

44

Table of Contents

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

Costco Wholesale Corporation:

We have audited Costco Wholesale Corporation’s internal control over financial reporting as of August 30, 2009, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying management’s annual report on internal control over financial reporting included in Item 9A. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of August 30, 2009, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of the Company as of August 30, 2009 and August 31, 2008, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for each of the 52-week periods ended August 30, 2009, August 31, 2008 and September 2, 2007, and our report dated October 16, 2009 expressed an unqualified opinion on those consolidated financial statements.

/s/ KPMG LLP

Seattle, Washington

October 16, 2009

45

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COSTCO WHOLESALE CORPORATION

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

Costco Wholesale Corporation:

We have audited Costco Wholesale Corporation’s (the Company) internal control over financial reporting as of August 31, 2008, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying management’s annual report on internal control over financial reporting included in Item 9A. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of August 31, 2008, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of the Company as of August 31, 2008 and September 2, 2007, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for the 52-week periods ended August 31, 2008 and September 2, 2007 and the 53-week period ended September 3, 2006, and our report dated October 16, 2008 expressed an unqualified opinion on those consolidated financial statements.

/s/ KPMG LLP

Seattle, Washington

October 16, 2008

43

Table of Contents

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

Costco Wholesale Corporation:

We have audited Costco Wholesale Corporation’s (the Company) internal control over financial reporting as of August 31, 2008, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying management’s annual report on internal control over financial reporting included in Item 9A. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of August 31, 2008, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of the Company as of August 31, 2008 and September 2, 2007, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for the 52-week periods ended August 31, 2008 and September 2, 2007 and the 53-week period ended September 3, 2006, and our report dated October 16, 2008 expressed an unqualified opinion on those consolidated financial statements.

/s/ KPMG LLP

Seattle, Washington

October 16, 2008

44

Table of Contents

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

Costco Wholesale Corporation:

We have audited Costco Wholesale Corporation’s (the Company) internal control over financial reporting as of September 2, 2007, based on criteria established in Internal Control Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying management’s annual report on internal control over financial reporting included in Item 9A. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of September 2, 2007, based on criteria established in Internal Control Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of the Company as of September 2, 2007 and September 3, 2006, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for the 52-week period ended September 2, 2007, the 53–week period ended September 3, 2006, and the 52-week period ended August 28, 2005, and our report dated October 24, 2007 expressed an unqualified opinion on those consolidated financial statements.

/s/ KPMG LLP

Seattle, Washington

October 24, 2007

5

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COSTCO WHOLESALE CORPORATION

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

Costco Wholesale Corporation:

We have audited Costco Wholesale Corporation’s (the Company) internal control over financial reporting as of September 2, 2007, based on criteria established in Internal Control Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying management’s annual report on internal control over financial reporting included in Item 9A. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of September 2, 2007, based on criteria established in Internal Control Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of the Company as of September 2, 2007 and September 3, 2006, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for the 52-week period ended September 2, 2007, the 53–week period ended September 3, 2006, and the 52-week period ended August 28, 2005, and our report dated October 24, 2007 expressed an unqualified opinion on those consolidated financial statements.

/s/ KPMG LLP

Seattle, Washington

October 24, 2007

40

Table of Contents

COSTCO WHOLESALE CORPORATION

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

Costco Wholesale Corporation:

We have audited management’s assessment, included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting appearing under Item 8, that Costco Wholesale Corporation and subsidiaries (the Company) maintained effective internal control over financial reporting as of September 3, 2006, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting. Our responsibility is to express an opinion on management’s assessment and an opinion on the effectiveness of the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, evaluating management’s assessment, testing and evaluating the design and operating effectiveness of internal control, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, management’s assessment that the Company maintained effective internal control over financial reporting as of September 3, 2006, is fairly stated, in all material respects, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Also, in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of September 3, 2006, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of the Company as of September 3, 2006 and August 28, 2005, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for the 53 weeks ended September 3, 2006, and the 52 weeks ended August 28, 2005 and August 29, 2004 and our report dated November 16, 2006 expressed an unqualified opinion on those consolidated financial statements. Our report refers to the Company’s adoption of Statement of Financial Accounting Standards No. 123(R), “Share-Based Payment” and Securities and Exchange Commission Staff Accounting Bulletin No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in the Current Year Financial Statements” effective August 29, 2005, the beginning of the Company’s fiscal year ended September 3, 2006.

/s/  KPMG LLP

Seattle, Washington

November 16, 2006

40

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COSTCO WHOLESALE CORPORATION

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders:

We have reviewed the condensed consolidated balance sheet of Costco Wholesale Corporation and subsidiaries as of May 7, 2006, the related condensed consolidated statements of income for the twelve-week and thirty-six-week periods ended May 7, 2006 and May 8, 2005 and the condensed consolidated statements of cash flows for the thirty-six-week periods ended May 7, 2006 and May 8, 2005. These condensed consolidated financial statements are the responsibility of the Company’s management.

We conducted our reviews in accordance with standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures to financial data and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Accounting Oversight Board (United States), the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our reviews, we are not aware of any material modifications that should be made to the condensed consolidated financial statements referred to above for them to be in conformity with U.S. generally accepted accounting principles.

As discussed in Note 1 to the condensed consolidated financial statements, effective August 29, 2005, the beginning of the Company’s fiscal 2006, the Company adopted Statement of Financial Accounting Standards No. 123 (revised 2004), “Share-Based Payment.”

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Costco Wholesale Corporation and subsidiaries as of August 28, 2005, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for the 52 weeks then ended (not presented herein); and in our report dated November 9, 2005, we expressed an unqualified opinion on those consolidated financial statements and disclosed that effective February 16, 2004, the Company adopted Emerging Issues Task Force Issue No. 03-10, “Application of Issue 02-16 by Resellers to Sales Incentives Offered to Consumers by Manufacturers,” and additionally, during the fiscal year ended August 31, 2003, the Company adopted Emerging Issues Task Force Issue No. 02-16 “Accounting by a Customer (Including a Reseller) for Certain Consideration Received from a Vendor,” based on the specific transition guidance. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of August 28, 2005, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

/S/ KPMG LLP

Seattle, Washington

June 15, 2006

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders:

We have reviewed the condensed consolidated balance sheet of Costco Wholesale Corporation and subsidiaries as of February 12, 2006, the related condensed consolidated statements of income for the twelve-week and twenty-four week periods ended February 12, 2006 and February 13, 2005 and the condensed consolidated statements of cash flows for the twenty-four-week periods ended February 12, 2006 and February 13, 2005. These condensed consolidated financial statements are the responsibility of the Company’s management.

We conducted our reviews in accordance with standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures to financial data and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Accounting Oversight Board (United States), the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our reviews, we are not aware of any material modifications that should be made to the condensed consolidated financial statements referred to above for them to be in conformity with U.S. generally accepted accounting principles.

As discussed in Note 1 to the condensed consolidated financial statements, effective August 29, 2005, the beginning of the Company’s fiscal 2006, the Company adopted Statement of Financial Accounting Standards No. 123 (revised 2003), “Share-Based Payment.”

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Costco Wholesale Corporation and subsidiaries as of August 28, 2005, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for the 52 weeks then ended (not presented herein); and in our report dated November 9, 2005, we expressed an unqualified opinion on those consolidated financial statements and disclosed that effective February 16, 2004, the Company adopted Emerging Issues Task Force Issue No. 03-10, “Application of Issue 02-16 by Resellers to Sales Incentives Offered to Consumers by Manufacturers,” and additionally, during the fiscal year ended August 31, 2003, the Company adopted Emerging Issues Task Force Issue No. 02-16 “Accounting by a Customer (Including a Reseller) for Certain Consideration Received from a Vendor,” based on the specific transition guidance. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of August 28, 2005, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

/S/ KPMG LLP

Seattle, Washington

March 20, 2006

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders

Costco Wholesale Corporation:

We have reviewed the condensed consolidated balance sheet of Costco Wholesale Corporation and subsidiaries as of November 20, 2005, the related condensed consolidated statements of income and cash flows for the twelve-week periods ended November 20, 2005 and November 21, 2004. These condensed consolidated financial statements are the responsibility of the Company’s management.

We conducted our reviews in accordance with standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures to financial data and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board (United States), the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our reviews, we are not aware of any material modifications that should be made to the condensed consolidated financial statements referred to above for them to be in conformity with U.S. generally accepted accounting principles.

As discussed in note 1 to the condensed consolidated financial statements, effective August 29, 2005, the beginning of the Company’s fiscal 2006, the Company adopted statement of Financial Accounting Standards No. 123 (revised), “Share-based Payments.”

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Costco Wholesale Corporation and subsidiaries as of August 28, 2005, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for the 52 weeks then ended (not presented herein); and in our report dated November 9, 2005, we expressed an unqualified opinion on those consolidated financial statements and disclosed that effective February 16, 2004, the Company adopted Emerging Issues Task Force Issue No. 03-10, “Application of Issue 02-16 by Resellers to Sales Incentives Offered to Consumers by Manufacturers,” and additionally, during the fiscal year ended August 31, 2003, the Company adopted Emerging Issues Task Force Issue No. 02-16 “Accounting by a Customer (Including a Reseller) for Certain Consideration Received from a Vendor,” based on the specific transaction guidance. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of August 28, 2005, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

/S/ KPMG LLP

Seattle, Washington

December 19, 2005

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

Costco Wholesale Corporation:

We have audited management’s assessment, included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting appearing under Item 8, that Costco Wholesale Corporation and subsidiaries (the Company) maintained effective internal control over financial reporting as of August 28, 2005, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting. Our responsibility is to express an opinion on management’s assessment and an opinion on the effectiveness of the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, evaluating management’s assessment, testing and evaluating the design and operating effectiveness of internal control, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, management’s assessment that the Company maintained effective internal control over financial reporting as of August 28, 2005, is fairly stated, in all material respects, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Also, in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of August 28, 2005, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of the Company as of August 28, 2005 and August 29 2004, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for the 52 weeks ended August 28, 2005, August 29, 2004 and August 31, 2003 and our report dated November 9, 2005 expressed an unqualified opinion on those consolidated financial statements. Our report refers to the Company’s change in method of accounting for cash consideration received from a vendor to conform to the requirements of Emerging Issues Task Force No. 03-10, effective February 16, 2004 and Issue No. 02-16 effective during the year ended August 31, 2003.

/s/  KPMG LLP

Seattle, Washington

November 9, 2005

37

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COSTCO WHOLESALE CORPORATION

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders:

We have reviewed the condensed consolidated balance sheet of Costco Wholesale Corporation and subsidiaries as of May 8, 2005, the related condensed consolidated statements of income for the twelve-week and thirty-six week periods ended May 8, 2005 and May 9, 2004 and the condensed consolidated statements of cash flows for the thirty-six-week periods ended May 8, 2005 and May 9, 2004. These condensed consolidated financial statements are the responsibility of the Company’s management.

We conducted our reviews in accordance with standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures to financial data and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board (United States), the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our reviews, we are not aware of any material modifications that should be made to the condensed consolidated financial statements referred to above for them to be in conformity with U.S. generally accepted accounting principles.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Costco Wholesale Corporation and subsidiaries as of August 29, 2004, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for the 52 weeks then ended (not presented herein); and in our report dated October 22, 2004, we expressed an unqualified opinion on those consolidated financial statements and disclosed that effective February 16, 2004, the Company adopted Emerging Issues Task Force Issue No. 03-10, “Application of Issue 02-16 by Resellers to Sales Incentives Offered to Consumers by Manufacturers,” and effective September 2, 2002, the Company adopted the fair value method of recording stock-based compensation expense in accordance with Statement of Financial Accounting Standards No. 123, “Accounting for Stock-Based Compensation.” Additionally, during the fiscal year ended August 31, 2003, the Company adopted Emerging Issues Task Force Issue No. 02-16 “Accounting by a Customer (Including a Reseller) for Certain Consideration Received from a Vendor,” based on the specific transaction guidance. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of August 29, 2004, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

/S/ KPMG LLP

Seattle, Washington

June 15, 2005

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders:

We have reviewed the condensed consolidated balance sheet of Costco Wholesale Corporation and subsidiaries as of February 13, 2005, the related condensed consolidated statements of income for the twelve-week and twenty-four week periods ended February 13, 2005 and February 15, 2004 and the condensed consolidated statements of cash flows for the twenty-four-week periods ended February 13, 2005 and February 15, 2004. These condensed consolidated financial statements are the responsibility of the Company’s management.

We conducted our reviews in accordance with standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures to financial data and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board (United States), the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our reviews, we are not aware of any material modifications that should be made to the condensed consolidated financial statements referred to above for them to be in conformity with U.S. generally accepted accounting principles.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Costco Wholesale Corporation and subsidiaries as of August 29, 2004, and the related consolidated statements of income, stockholders’ equity and comprehensive income, and cash flows for the 52 weeks then ended (not presented herein); and in our report dated October 22, 2004, we expressed an unqualified opinion on those consolidated financial statements and disclosed that effective February 16, 2004, the Company adopted Emerging Issues Task Force Issue No. 03-10, “Application of Issue 02-16 by Resellers to Sales Incentives Offered to Consumers by Manufacturers,” and effective September 2, 2002, the Company adopted the fair value method of recording stock-based compensation expense in accordance with Statement of Financial Accounting Standards No. 123, “Accounting for Stock-Based Compensation.” Additionally, as discussed in Note 1 to the consolidated financial statements, during the fiscal year ended August 31, 2003, the Company adopted Emerging Issues Task Force Issue No. 02-16 “Accounting by a Customer (Including a Reseller) for Certain Consideration Received from a Vendor,” based on the specific transaction guidance. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of August 29, 2004, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

/S/ KPMG LLP

Seattle, Washington

March 23, 2005