N.J. Stat. § 19:23-27
Not later than twelve o'clock noon of the Saturday preceding a primary for the general election each municipal clerk shall have had printed and on hand in his office for the use of each of the political parties official primary ballots equal in number to one and one-tenth times the number of votes cast by such political party at the last preceding general election at which electors for president and vice president of the United States were voted for in such election district.
When an election district shall have been divided or the boundaries thereof changed, or a new district created, the municipal clerk shall ascertain as nearly as may be possible the number of voters in the new or rearranged or divided district, and provide therefor a sufficient number of official primary ballots in the above proportion.
The cost of printing the official primary ballots shall be paid by the respective municipalities.
N.J.S. § 19:23-27