N.Y. Gen. Mun. Law § 104
Notwithstanding the provisions of section one hundred three of this article or of any other general, special or local law, any officer, board or agency of a political subdivision, of a district therein, of a fire company or of a voluntary ambulance service is authorized to make purchases of commodities and services available pursuant to section one hundred sixty-three of the state finance law, may make such purchases through the office of general services subject to such rules as may be established from time to time pursuant to section one hundred sixty-three of the state finance law or through the general services administration pursuant to section 1555 of the federal acquisition streamlining act of 1994, P.L. 103-355; provided that any such purchase shall exceed five hundred dollars and that the political subdivision, district, fire company or voluntary ambulance service for which such officer, board or agency acts shall accept sole responsibility for any payment due the vendor. All purchases shall be subject to audit and inspection by the political subdivision, district, fire company or voluntary ambulance service for which made. No officer, board or agency of a political subdivision, or a district therein, of a fire company or of a voluntary ambulance service shall make any purchase through such office when bids have been received for such purchase by such officer, board or agency, unless such purchase may be made upon the same terms, conditions and specifications at a lower price through such office. Two or more fire companies or voluntary ambulance services may join in making purchases pursuant to this section, and for the purposes of this section such groups shall be deemed "fire companies or voluntary ambulance services."
N.Y. Gen. Mun. Law § 104