It was $9.99 at Best Buy, of course you had to pay tax on it. I finally got around to playing it and couldn't really get into any of the games. Limbo has very solid physics and a neat concept but it just bored the hell out of me. You have to be in the mindset and patient mood to enjoy a game like that, and admittedly I just haven't been.
Still, probably can't go wrong for $10.