I found a good video game store! It's called Gameplay, and it actually sells retro games, even to Atari 2600. And this is coming right from the heels of when Gamestop ceased dealing in Gamecube games.
Maybe later I'll take some photos of things I get there. I found a Sega 32x, a model 1 Genesis with Power Base Converter, and an NES Max controller, to name a few.