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WinGameStore is running a 2015 Holiday Sale. Ends on 1/3. Every day there are daily flash deals that are deeply discounted games in addition to discounts on a bunch of other games.
Flash Sales for 12/25:
Breach & Clear: Deadline $3
Shadow Warrior $8
Darksiders $4
Dungeons 2 $10
Alan Wake $7.49
Warlock 2: The Exiled $5
realMyst: Masterpiece Edition $4.49
Kingdom Rush $2.49
SteamWorld Dig: A Fistful of Dirt $2.49
The Escapists $5.39
Crookz – The Big Heist $10.49
The Vanishing of Ethan Carter $7
MouseCraft $5.24
Middle-earth: Shadow of Mordor Game of the Year Edition $18
Verdun $9.19
Mad Max $36
Grand Ages: Medieval $24
Misc Deal
Kerbal Space Program $20 – This is $4 cheaper than the current Steam price.