The best deal is Pokemon Emerald for the GBA, which the retailer is offering for $14.99. If you want something more modern, though, you could pick up either Diamond or Pearl, which are marked down to $24.99 for the week. Also, if your sights are set on one of the Mystery Dungeon games, purchasing one at Circuit City will net you a free Pokemon action figure. Unfortunately, we don't know what these figures look like, but since they're free with the purchase, we're not all that concerned.
The best part is that these deals are offered online at CircuitCity.com, too, so you don't have to actually leave the comfort of your own home and, you know, socialize.