Old school Bethesda games are up to 75% off over at GOG.com. That includes the original Fallout 1 and 2 as well as Fallout Tactics, and the original Quake and Doom games. Purchase a Bethesda game and you'll get The Elder Scrolls: Arena and The Elder Scrolls II: Daggerfall free. The sale ends December 29th and more details can be found on the website itself.