Yes, they have sega, and atari.
I'm not certain if they carry Sega or not, but it is likely, as you can find games dating all the way back to the NES (possibly Atari, I've never checked). Even if they don't have any in stock I'd still recommend giving the place a look. It's a friendly environment and prices are always great. They also host various TCG tournaments quite frequently.
Thanks! Your answer is awaiting moderation.