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GamersGate / GamersGate UK has Outlast 66% off as the daily deal for 1/6/14. Their Weekly Deals are also available. Note that a bunch of their End of Year deals are still up. They’ll probably be removed any time now.
Daily Deal
Outlast $6.80 (Steamworks)
Just Cause Midweek Sale
Just Cause Collection $10 (Steamworks)
Just Cause 2 $3.74 (Steamworks)
Just Cause 2 DLC $0.25-$0.50 each.
Just Cause $1.74
Europa Universalis Sale
Europa Universalis IV $20 (Steamworks)
Europa Universalis IV Digital Extreme Edition $22.50 (Steamworks)
Europa Universalis IV: Call-to-Arms Pack $2 (Steamworks)
Europa Universalis IV DLC $1-$13.49
Europa Universalis 3 Complete $3.74
Europa Universalis 3 $2.49
Europa Universalis 3 DLC $0.50-$2.49 each
Europa Universalis 2 $5
For the Glory – A Europa Universalis Game $2.49
Europa Universalis Rome Gold $2.49
Europa Universalis $1.48
Europa Universalis: Crown of the North $1.48