N.J. Stat. § 18A:64-67
There may be required from any person bidding on any purchase, contract or agreement, advertised in accordance with law, that the bid be accompanied by a guaranty payable to the State college that, if the purchase, contract or agreement is awarded to him, he will enter into a contract therefor. The guaranty shall be in the amount of 10% of the bid but not in excess of $20,000.00, except as otherwise provided herein, and may be given, at the option of the bidder, by certified check, cashier's check or bid bond. For a construction contract the guaranty shall be in the amount of 10% of the bid. In the event that any law or regulation of the United States imposes any condition upon the awarding of a monetary grant to any State college, which condition requires a guaranty in an amount other than 10% of the bid or in excess of $20,000.00, the provisions of this section shall not apply and the requirements of the law or regulation of the United States shall govern.
The college may require a bid guaranty alone without also requiring a performance bond or other security in the contract.
N.J.S. § 18A:64-67