
If you want a complete reference book that lists EVERY G.I. Joe product ever made, then you want The Complete Encyclopedia To G.I. Joe. It is available for $25 from Krause Publications, the publishers of The Toy Shop newspaper.
Here is a short list of major dealers of G.I. Joe figures and equipment, who have prominent ads in The Toy Shop. I have no personal experience dealing with these people! I am simply passing on to you contact information. The guys who take out full page ads are:
And some smaller dealers:
There are various G.I. Joe Collectors conventions held each year. Call the G.I. Collectors Club of Southern California, at (818) 563-1179 about conventions.
Also contact Marz Productions at (407) 260-8869. They say they are the official promotors of the GI Collectors Conventions, and they have convention-special figures for sale.