Section 408. Supplies and equipment

1. 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.