N.Y. Comp. Codes R. & Regs. tit. 9 § 7016.1 : EXECUTIVE DEPARTMENT — STATE COMMISSION OF CORRECTION — MINIMUM STANDARDS AND REGULATIONS FOR MANAGEMENT OF COUNTY JAILS AND PENITENTIARIES — MINIMUM STANDARDS AND REGULATIONS — Commissary And Inmate Accounts — Commissary

(a) In the discretion of the sheriff or chief administrative officer, a commissary may be established, maintained and operated for the purpose of making available, for sale to prisoners, items deemed proper by such officials and consistent with the health and welfare of the prisoners and the security and general operation of the facility concerned.
(b) The prices of any items offered for sale shall be fixed by the sheriff, or official in charge, to the extent that the commissary operation will be self-supporting and will provide a modest return above costs.
(c) Profits resulting from commissary sales shall be deposited in a separate bank account and shall be utilized only for purposes of prisoner welfare and rehabilitation.
(d) Commissary accounts shall be maintained in a manner which will fully substantiate all purchases, sales and expenditures, and definite arrangements shall be made for periodic audit of the commissary accounts by the office of county auditor, county treasurer or other county officer in a similar capacity.
(e) Nothing in this section shall be construed as exempting commissary operations in a county jail or a county penitentiary from compliance with the provisions of any applicable county or State statute, resolution, rule, regulation, etc.

N.Y. Comp. Codes R. & Regs. Tit. 9 § 7016.1