N.J. Stat. § 52:27B-61
Each using agency shall, at all times, in the form and for the periods prescribed by the director, present to him detailed applications and schedules for all articles to be purchased. The director shall then arrange such schedules or parts thereof for purchase and contract, in the manner best calculated to attract competition and advantageous prices. He shall award contracts or orders for purchase to the lowest responsible bidder meeting all specifications and conditions. He shall have authority to reject any or all bids or to award in whole or in part if deemed to the best interest of the State to do so. In case of tie bids, he shall have authority to award orders or contracts to the vendor or vendors best meeting all specifications and conditions. Public bids shall not be waived except with the written approval of the commissioner and except after notice in writing to the State Auditor. The director shall prescribe the terms and conditions for delivery, inspection, payment and all other detail whatsoever. In purchases of fresh milk and as a condition thereof, the director shall require each vendor to certify in writing that he purchased during the immediately preceding year fresh milk produced within the State at least equal in amount to the amount he seeks to furnish to the using agency, and, in addition, to agree to purchase during the year in which he proposes to furnish such milk to the using agency an amount of fresh milk produced within the State at least equal to the amount he proposes to furnish to the using agency plus an amount equal to the amount, if any, he shall be required to furnish to any other using agency.
Upon the award of contracts or orders for purchase, the director shall thereupon make an encumbrance request to the commissioner for the amount necessary to defray the cost thereof, indicating the appropriations or authorizations to spend funds against which the contract or purchase order will be charged.
The bills for such purchases shall be apportioned by the director among the using agencies in proportion to the purchases made therefor, and certified as apportioned to the commissioner, to be charged against the respective appropriations or authorizations to spend as indicated by the certificate of the director. The bills therefor shall be paid by warrant check of the commissioner and State Treasurer.
Nothing in this article shall be construed to repeal or otherwise affect any law of this State relating to the purchase or use of the products of the labor of the inmates of a charitable, reformatory or penal institution of this State.
N.J.S. § 52:27B-61