N.J. Stat. § 19:6-21
The county boards shall be provided by the board of chosen freeholders of the respective counties with a suitable office or offices, furniture and such other equipment as the county boards deem necessary. The county board in counties of the first class shall have power to purchase office equipment, furniture, furnishings, books, stationery, materials, supplies and other articles or equipment necessary in the judgment of the board, to carry out the provisions of this Title, and the board of chosen freeholders of the respective counties shall pay for the same, including the expenses of the board and the clerk thereof, upon certification of the county board. Nothing in subtitle two of the Title Municipalities and Counties (paras. 40:16-1 et seq.) shall in anywise be construed to affect, restrict or abridge the powers herein conferred on the county boards.
N.J.S. § 19:6-21