Much like the 360 version of Super Meat Boy, early adopters save $5. It doesn't come out until next Tuesday so I don't think that there will be any chance for a BF sale.
One thing that you should note is that there are two versions of the game on PC - the Steam version has the Headcrab as a playable character and all other versions have the Goo ball (from WoG) as a playable character. Both replace Gish from the 360 version.
Edited by GenJox, 23 November 2010 - 11:28 PM.