Both Rage and its DLCs are 75% off on Steam for the next 2 days. http://store.steampowered.com/app/209460/
Gamersgate has Civilization 5 Complete on sale, at the US price: http://www.gamersgate.com/DD-CIV5CE/sid-meiers-civilization-…
I received a 20% off coupon from Gamersgate for Halloween, but cannot share since it is a 1 use, account linked code. They seem to send out discount codes 3-4 times a year.