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Company of Heroes is super cheap on Direct2Drive (D2D) currently.
This is a really good deal for a really fun Real Time Strategy (RTS) game that takes place during WWII. The game has a 93 metascore on metacritic.
The game is currently priced $3.74 but promo code MARCHMADNESS drops it to $2.99. The coupon is actually good for 20% off all the games on the site.