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Green Man Gaming (GMG) has some Christmas / Winter voucher codes good on select titles. Should end up being some good deals.
WARIN-SNOWY-NORTH : Grab Lord of the Rings: War in the North for a massive 60% off!
(Valid from 1500 GMT 22nd December until 1500 GMT 23rd December)
After the voucher code, LOTR ends up being only $12.32. The game uses Steamworks so you’ll have to activate it on Steam.
GREEN-XMASS-AINTS : Grab Saints Row: The Third for a massive 25% off!
(Valid from 0000 GMT 23rd December until 0000 GMT 26th December)
This game uses Steamworks.
SQUAR-EWKND-SIXTY : Grab anything from our Square Enix catalogue (except Deus Ex: Human Revolution titles) for a massive 66% off!
(Valid from 0000 GMT 23rd December until 0000 GMT 26th December)
JOLLY-BRUCE-WAYNE : Grab Batman: Arkham City for a massive 60% off!
(Valid from 1600 GMT 26th December until 1600 GMT 27th December)
Uses GFWL
GREEN-SPACE-MARIN : Grab Space Marine for a massive 40% off!
(Valid from 0000 GMT 26th December until 0000 GMT 29th December)
Uses Steamworks
In addition to those voucher codes, GMG has some other deals going on. Iceburg Interactive titles are 50% off.
They also have some GMG picks that come with discounts:
Freedom Force vs. the Third Reich = $3.79
Penumbra Collection = $5.99
Hitman 2: Silent Assassin = $5.57
These are probably cheaper at Steam or will be at some point.