Section 408 - Supplies and equipment1. Except as otherwise provided by law and when the office of county purchasing agent has not been created, each officer paid compensation from county funds shall have power, subject to rules of the board, to purchase necessary supplies and equipment for his respective office or department within the limits of the appropriation therefor.2. The board of supervisors may authorize the purchase of supplies and equipment through the office of the clerk of the board.3. The board of supervisors may authorize the purchasing agent or clerk of the board to purchase for and on behalf of the towns forms of vouchers, budgets, account books, loose leaf ledger sheets, envelopes, notices, reports and other uniform staple office supplies, subject to the provisions of section four hundred eight-a of the county law and section one hundred three of the general municipal law. By resolution the board of supervisors shall determine the manner of requisition and of payment in reimbursement.