the thread about cheap PSX and GC games at Target prompted this.
It's worth it to make Target a regular stop when looking for games. They put a lot of games on clearance and it's pretty random from store to store. These are clearances so they are not advertised in the weekly sale paper.
A few scores: Dino Stalker PS2 $15, Maximo PS2 $15, Darkstone PS1 $2.98, Jet Grind Radio DC $2.50, Metal Gear Solid PS1 $7.98.
Goodwill Hunters post mentioned the Game Cube games.
I think it's well worth a frequent look.