Section 41-B - In any town in which the office of director of purchasing shall have been established and a director of purchasing shall have been appointed and shall have qualified, the director of purchasing shall make all purchases and all contracts for supplies, materials and equipment of every nature for the town and for any town department, board or agency for which the town may in any event be liable and for any special improvement district within such town except for a district having a separate board of commissionersBefore making any purchase, the director of purchasing shall comply with such rules and regulations in relation thereto as may be established by resolution of the town board and such provisions of law as may be applicable thereto.