Going to repost my info from my reply on the GMG deal in case anyone needs it:
GMG just added xcom too. You get $14 or $15 (depending on if you do cash back or future credit), bioshock 1, x-com, and one extra game (from this list Spec Ops: The Line , Civilization V, BioShock 2, Mafia II or The Darkness II).
And you get a key for the browser pre-order game bonus Industrial Revolution.http://www.greenmangaming.com/bundles/
Basically the only thing you don't get compared to steam deal is the TF2 items, instead you get an additional free game.
They also have a 20% off voucher for the season pass
I will likely wait until the price comes down, but all in all this is a pretty good pre-order deal.
Edit: My bad, the season pass is on a small sale already, and the voucher doesn't work on it.This comment was edited on Mar 25, 2013, 22:17.