There's a nice promo on GOG today, The Witcher franchise is on sale, check it out! It's DRM free :)
Super Meat Boy was already on Steam sale few days ago but here it’s a little bit cheaper, going for $3.74. Again if you are suicidal don’t buy this. Another one is Port Royale 3, it’s whole franchise is currently on sale. If you’re into strategy games go ahead and get it, here’s a full list of the games.