Walmart has launched a new online video game store called Gamecenter, which the company describes as a one-stop destination for video game previews, first look exclusives and special savings. To promote the launch of the site, Walmart.com is offering a $50 eGift Card to people that preorder three or more new titles, including "Medal of Honor," "Assassin's Creed: Brotherhood," and "Fallout: New Vegas." Walmart said all videos games ordered can be shipped for 97 cents each.