<Page> Exhibit 3.31 STATE OF VERMONT OFFICE OF SECRETARY OF STATE [GRAPHIC] I, DEBORAH L. MARKOWITZ, SECRETARY OF STATE OF THE STATE OF VERMONT, DO HEREBY CERTIFY THAT THE ATTACHED IS A CERTIFIED COPY OF. CORPORATION DDOCUMENTS FOR MAXI GREEN INC. JULY 23, 2004 GIVEN UNDER MY HAND AND THE SEAL OF THE STATE OF VERMONT, AT MONTPELIER, THE STATE CAPITAL /s/ Deborah L. Markowitz DEBORAH L. MARKOWITZ [SEAL] SECRETARY OF STATE <Page> ARTICLES OF INCORPORATION OF MAXI GREEN INC. STATE OF VERMONT Secretary of State's Office Filed May 21, 2003 VERMONT SECRETARY OF STATE /s/ [ILLEGIBLE] ---------------------- 2003 MAY 21 AM 8:39 SECRETARY OF STATE Filing Fee of $75 has been paid <Page> ARTICLES OF INCORPORATION OF MAXI GREEN INC. ARTICLE I NAME The name of the corporation shall be Maxi Green Inc. ARTICLE II REGISTERED OFFICE AND REGISTERED AGENT The initial registered office of the corporation shall be One Church Street, City of Burlington, County of Chittenden, State of Vermont 05401, and the initial registered agent at such address shall be Paul, Frank & Collins a Professional Corporation. ARTICLE III OPERATING YEAR The fiscal year end of the corporation shall be May 31, or as fixed by the board of directors from time to time. ARTICLE IV GENERAL CORPORATION This corporation is a Vermont general corporation, formed pursuant to Title 11A of Vermont Statutes Annotated, which is entitled the "Vermont Business Corporation Act." 1 <Page> ARTICLE V AUTHORIZED SHARES The aggregate number of shares the corporation shall have authority to issue is ten thousand (10,000) shares of one class of shares, no par value per share, said class consisting of voting common shares. The sole class of shares shall have unlimited voting rights and shall be entitled to receive the net assets of the corporation upon dissolution. ARTICLE VI SHAREHOLDER ACTION WITHOUT MEETING Action required or permitted to be taken by the shareholders of the corporation at a shareholders' meeting may be taken without a meeting if the action is taken by the holders of at least a majority of all of the shares entitled to vote on the action, and if each shareholder is given prior notice of the action proposed to be taken. Each action must be evidenced by one or more written consents describing the action taken, signed by the holders of at least a majority of the shares, and filed in the corporate minute book. Prompt notice of any action taken by less than unanimous written consent in lieu of a meeting shall be given to all shareholders entitled to vote on such action. ARTICLE VII GREATER QUORUM OR VOTING REQUIREMENTS FOR SHAREHOLDERS The shareholders of the corporation may adopt or amend a bylaw that fixes a greater quorum or voting requirement for shareholders (or voting groups of shareholders) than is required by the Vermont Business Corporation Act. ARTICLE VIII DIRECTOR LIABILITY To the extent permitted by Section 2.02(b)(4) of the Vermont Business Corporation Act, as the same may be supplemented and amended, no director of the corporation shall be personally liable to the corporation or its shareholders for money damages for any action taken, or any failure to take any action, solely as a director, based on a failure to discharge his or her own duties in accordance with Section 8.30 of the Vermont Business Corporation Act, as the same may be supplemented and amended. 2 <Page> ARTICLE IX INITIAL BOARD OF DIRECTORS Initially the corporation shall have two directors. The following individuals shall serve as the corporation's initial directors: <Table> <Caption> NAME ADDRESS - ---- ------- Michel Coutu 199 Grotto Avenue Providence, RI 02906 Randy A, Wyrofsky 105 Weeks Hill Road Coventry, RI 02816 </Table> ARTICLE X INCORPORATOR The name and address of the sole incorporator is: <Table> <Caption> NAME ADDRESS - ---- ------- Christopher J. Leff, Esq. 337 College Street, #12 Burlington, VT 05401 </Table> Executed by the undersigned incorporator as of this 16th day of May, 2003. INCORPORATOR: /s/ Christopher J. Leff ----------------------------------- Christopher J. Leff, Esq 3