Total War: Shogun 2
Price: $14.99 (50% Off)
The Total War franchise may not be the most celebrated in the strategy genre, but there's nothing quite like its Shogun line which lets you conquer all of feudal Japan. Total War: Shogun 2 and its expansion, Fall of the Samurai are both on sale at Gamefly for half-price.
If you're looking for some of the series' classics, the rest of the games can be picked up over here for up to 66% off.