Pawn Stars had an original Gatling Gun on their episode this week. The guy was hanging tough, he was in the market to get over 300k, but the shop wouldn't budge of 220k. Prices seem a bit high, even for original guns, although they will get it some day as everything goes up. However, it seems to be a much later gun than Civil War era, and the magazine is a later design also. If you like a real Civil War gun (Well, a faithful reproduction) that is period correct, you can get one on this site for only 34k. Functions like the real one, and also uses period correct paper wrapped bullets in steel sleeves, something that an 1862 Gatling Gun had to use. Check it out.
