N.Y. Gen. Mun. Law § 109-A
The New York State Association of Counties, the Association of Towns of the State of New York, the New York State Town Clerk's Association, Inc., the New York State Conference of Mayors and Other Municipal Officials, the New York State School Boards Association, Inc., the New York Planning Federation and the Association of Fire Districts of the State of New York, the New York State Association of School Business Officials, the New York state council of school superintendents, any nonpublic elementary and/or secondary school of the state of New York, which provides the instruction required by section thirty-two hundred four and article seventeen of the education law, and which is chartered by, registered with or subject to examination and inspection by the department of education and which is a not for profit institution and any public library, association library, library system, cooperative library system, the New York Library Association, and the New York State Association of Library Boards or any other library except those which are operated by for profit entities, may make purchases through the office of general services subject to such rules as may be promulgated pursuant to section one hundred sixty-three of the state finance law and subdivision eight-a of section one hundred three of this article which may establish limitations with respect to commodities and impose such other appropriate conditions upon purchasing as deemed necessary by the commissioner of general services in order to protect the state's own purchasing interests; and that such association, school, library, library system or cooperative library system shall accept sole responsibility for any payment due the vendor. Boards of education may permit such nonpublic schools to make purchases pursuant to this section through the school district in which the nonpublic school is located, provided that any administrative costs incurred by the school district will be paid by the nonpublic school.
N.Y. Gen. Mun. Law § 109-A