Not sure if this has been posted yet or not, but amazon is having a PC downloadable games megasale.
So many games, x-com, command and conquer, batman, mortal kombat, dead space, bioshock 1 and 2, dark souls prepare to die, rayman, age of empires 3, driver san fran, mass effect 3, a bunch of sonic games. Mostly steam some origin.
For full details, check the link. http://kotaku.com/moneysaver-special-edition-1500-games-on-sale-506977987
Edit: As of the time of this post, dark souls is not available. :( Bummer!