Pretty decent sale going on on Gog. http://www.gog.com/pick_5 Not a huge selection of games, but a few definitely good ones there like Grimrock, Riddick, original witcher, sam and max, back to the future, heard good things about deponia, even alan wake and even divinity 2.
I'll second this, I already have Grimrock and The Witcher (both great games) or I'd have been tempted to take them up on this.
