How about from a former NJ member? Been gone about 4 years now.
Your "Central" location is kinda vague. I used to live in Hunterdon Cty., and found the best place for militaria was the "Forks of the Delaware Historical Arms Collectors" shows at the Allentown (PA) Fairgrounds. All firearms & militaria, no jerky & jewelery, and generally full of vendors and shoppers. I seem to recall that they hold them every 3 months or so.
Website:Forks of the Delaware Historical Arms Society, Inc.
Doesn't show 2010 schedule, but their ad in Arms Collector says: May 8/9, July 10/11, Oct 16/17 and Dec 4/5 for 2010.
Hope that helps!