Mac game maker Aspyr has selected four titles from its catalog for a special month-end sale. From now through the end of January, Prey, Tomb Raider II, Duke Nukem Forever and Neverwinter Nights 2 for Mac will be on sale for $5, up to 75 percent off their normal price. The sale prices are already available for the Mac App Store versions, which require Intel Macs running OS X 10.6.6 or higher. Graphics requirements vary by game.