Fallout, Fallout 2, and Fallout Tactics have been pretty cheap in recent years, but GoGamer's new sale price of $10.90 for all three is the lowest I've seen them go. A smokin' deal, especially if you've never picked them up in the past.
You can also grab Gothic 3: Forsaken Gods for a mere $3.90. Both deals end 87 hours from now, so jump on them soon.