I know it's not a crazy deal or anything, but it's The Witcher 2!
Here are some links:
Steam
http://store.steampowered.com/app/20920/
GOG
http://gog.com/en/page/tw2_preorder/
Impulse
http://www.impulsedriven.com/witcher2
GamersGate...
Both Dead Space and Mirror's Edge are going for $7.98, Need for Speed Shift is also 50% off at 14.97, and a few other games are on sale as well. Link below:
http://www.gamersgate.com/offers