Gamerush/Blockbuster was holding a 50% off sale on Nintendo games a few weeks back. You may want to check there. As for psychonauts, I'd hold off. I don't think the game has been selling well, so it will likely price drop soon.
[quote name='MysterD']Anybody know where to find Psychonauts for the PC cheap?[/QUOTE]
I remember seeing the PC version for $20 online... I think it was at EB.
Good luck with a deal on Pikmin 2... even though it didn't sell as well as Nintendo had hoped, I've never seen a deal on it. Still, this game is worth $50 especially if you have somebody to play the multiplayer with (maybe your g/f will be interested).