Forums are the places to go these days to buy old games. Tight-knit, self-policing communities like the one here are the best because not only do they offer great deals to real fans that love playing games, but they keep them out of the hands of resellers whenever possible.
The Nintendo Age crowd is very collector-based, but you can still get some great deals there from time to time. The majority of gamers I've interacted with have always been good people who help out others like them. It's a very inclusive group, despite what some media outlets have been saying recently. It's the people that don't care about games at all and see them as the current, hot revenue stream that screw you over. Ebay, barring small miracles like galam's Dynastic Hero (CURSE YOU, GALAM *shakes fist*) is pretty much over.
I just hope the prices continue to inflate quickly until the general gaming public is scared off and the bottom falls out. Combine that with (hopefully) the new consoles taking off at some point or the emerging VR tech taking over the easily swayed general public's imagination and people move on from this "retro" kick.
PS - retro means to make something new in an old style. Super Meat Boy is a retro game. Old games are just old games. I don't even think that's a battle worth fighting these days, though. That word done changed.
