The AT&T One X just became available for pre-order, and now it seems that AT&T stores are preparing to show off demo units on store shelves. A set of photos acquired by AndroidCentral shows a One X demo unit with clear as day AT&T branding. The One X launches on AT&T’s network on May 6th for $199.99 with a two-year contract. Will the AT&T version be as good as its international Tegra-3 sibling? We’ll know soon enough!