http://www.amazon.com/gp/product/B004VKH9RM/ref=as_li_ss_tl?ie=UTF8&tag=dg05-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=B004VKH9RM
I didn't see this posted anywhere, but yea, it's 5 bucks for the PC version. Based on the comments on Amazon, you can link the game to steam.