Nicky,
It depends on the quality you're looking for. If you're looking for beginner cellos, you should check out some music stores in your area or in NYC. If you're looking for cellos that are beginner-intermediate, check out Kolstein's (
www.kolstein.com) on Long Island. He has about 20-30 of them spanning all ranges in price. If you're looking for intermediate-expert, check out the shop run by Rene Morel and Emanuel Gradoux-Matt in NYC. They have instruments ranging all the way up to Stradivari, Guarneri, etc. All this assumes that you since you're in NJ, you have no trouble getting to NYC. Hope this helps!