A weekend deal on Steam offers the X-COM- Complete Pack for $4.99, which is almost $20.00 off this collection of classic sci-fi strategy games. There's also a weekend promo on GOG.com, where the good old gamers have a $9.98 bundle of Sacrifice and Giants: Citizen Kabuto, and those who have already purchased either title from their DRM-free marketplace can get a $1.00 discount on the other.