Although the stuff isn't really for sale at this point, you guys may want to check out Chris Bieniek's awesome historical preservation site, www.video-game-ephemera.com.
There are several things from the 90s with obscure facts and items about many systems and companies, including Nintendo, Sega, 3DO, and more. And you get his insider knowledge and attitude. Check it out. I'm promoting it as a friend and because I think it's excellent stuff.