Another cheap games weekend over on Steam...this one will net you 25% off selected Activision titles. It's not a huge list, but there are some decent titles on there. I can highly recommend both Transformers games.
I'm a bit surprised to see some of the old Sierra titles up there under Activision's banner...my guess is that there was a buyout at some point and I just didn't notice. Whatever the case, you can't go wrong with the King's Quest or Space Quest collections.
I also see one of my favorite PC games of all time, Vampire: The Masquerade - Bloodlines. Surprised it's going for $19.99 ($14.99 during the sale), given its age, but still well worth the price. I was never really into the pen & paper Vampire game, but Bloodlines is a double dose of awesome. There's a healthy mod community still alive out there (be sure to grab the unofficial 8.7 patch). The publisher, Troika Games, sadly folded shortly after Bloodlines hit the market, but community support has been phenomenal. If ever there was a game worthy of a Kickstarted sequel, this is it.
Well...this, and RCR. Seriously, folks. Give them money. I want to play this game.