I managed to go to my local Gamecrazy today. I picked up Mafia, Shinobi, and Fallout so those prices I can confirm and give a guarantee (unless these are YMMV to your area of course) and I thought it would be helpful if we started to compile a list of the games that are part of this sale. Maybe a mod or the OP will add this to original post.
La Pucelle Tactics (PS2)-19.99 (Great deal if you didn't get in on this at the Target deal or one of the others)
Amazing island (GCN)-19.99
Viewtiful Joe (PS2)- 19.99
Shinobi (Ps2)-9.99
Mafia (Xbox)- 9.99
Fallout: Brotherhood of Steel (PS2) 9.99
Nightshade (PS2)- 12.99
Return to Castle Wolfenstein (PS2) - 9.99
Magic the Gathering: Battleground (Xbox) - 14.99
Thief: Deadly Shadows (Xbox) - 12.99/14.99 (I couldn't remember which it was so I put either. Still it's only a two dollar difference but as long as it gives you a range for how much it should cost, I think it is worth it.)
These are all that I can remember but I know that Final Fantasy: Crystal Chronicles (GCN), 1080 Avalanche (GCN), Metroid Prime (GCN), Rygar (PS2), and others were apart of the sale. I just cannot remember there prices. I think that FF: CC was 19.99 and 1080 Avalanche and Metroid Prime were both 14.99 if I'm not mistaken but don't qoute me on that one.