I'm not finding a listing on Amazon just yet, but a seller on eBay has copies for a Buy It Now price of $21.99 (which, of course, could mean that it's not officially released yet).
Below is a YouTube video showing the gameplay. Looks pretty cool! You know, I've been wondering why we hadn't seen a Houdini videogame yet? I wonder no more.
UPDATE: You can now download this game for play on your PC from Big Fish Games.