Not specifically a sale, but it's heavily discounted from the release price.
Psychonauts is on there for ten bucks. It's hard to believe such a good game going for so cheap. If you've never played it, shame on you. If you've never heard of it, well, you aren't the only one. That was really the main issue with the game, it was critically praised, but consumers never bought it. If you're looking for a genuinely funny game with great characters and utterly unique level design, pick this one up.
And for those of you who loved Psychonauts the first time around, take a look at
this.
MrRigger