But wait, there's more! Using another GameFly deal, you can actually knock the price down to only six bucks. All you have to do is use the coupon code GFDFEB20, which takes an additional 20 percent off the price of PC downloads. Of course, if you're not in the mood for Civilization, you could always apply it to a different PC download, say, a pre-order of Tomb Raider. Already discounted to $45, the coupon drops it down to $36.