I'm not sure if it's only my area or if it's everyones area, but last night I went to Walmart just to get a quick meal when stopping at someones house and went to electronics just to look around(because their game section at this Walmart is actually fairly large.)
Anyways. I ended up picking Contra 4 up for 15 dollars on clearance. The ones I can remember off the top of my head that I saw was Mega Man ZX and the first two DBZ Budokai Tenkaichi games for 15, and various other games. There was also a DS carry case/game bundle clearanced for 10 dollars, one featuring Elite Beat Agents which I've heard around that people said was good. Then finally they had one wall with Rock Band drums for 49.99, Wireless Guitar and GH3 for 79.99 all systems and Wireless Guitar and GHAerosmith for 69.99.
Not sure if it's all Walmarts, but I'd say it's worth checking out.