I didn't catch any 360 deals, though I didn't price check either. As for the PSP games, the only one I remember off hand was the orange clearance sticker on Wipeout Pure, I think for around $15.
The problem with the place is that not all the games that are on clearance aren't labeled. I tried the Gamecube games after finding NG:B with a sticker, and was happy to find the ones that I did, but disappointed to find that neither Odama nor MarioKart nor Starfox Assault were any less than their normal prices, $50, $30 and $20 respectively.
But, like I said, the other Gamecube games, like Chibi, Fire Emblem, and Pikmin, were unmarked clearance items. Its a fishing expedition, but the clerks were kind enough to induldge my pricing efforts. I did see San Andreas for $9.99 in a $9.99 bin with a bunch of other games I wasn't really interested in. I'm thinking about heading back, getting a few copies of Pikmin, and then trading them in down the street for $7 at Gamestop (I checked the prices yesterday). Three tradeins will get you $10 bonus, plus the GamersEdge card 10%, so if you've got time to burn, you can make some trading dollars.
Good luck!