Hobby Emporium, Tyngsboro, MA.
Hobby Emporium is good, if you get the chance, check out Spare Time Hobbies in Marlboro, they have a big selection of old j-tin too. Just found your blog, good stuff, I am a northern mass vintage car buff (mostly j-tin) and JNC member as well. Also putting together a blog about local vintage car stuff coming out soon. Maybe see you around this summer! -Brad (TSiSS350 on JNC)