Europeans have been able to preorder the HTC Flyer for months, and now curious Yanks are about to get their chance, too. The tablet will be available for preorder on April 24th (that's this Sunday) for $499 with Best Buy as the exclusive seller. Though our friends across the pond have been able to snag 3G versions, the one about to come stateside just has WiFi. The Flyer, as you'll remember, is the phone maker's first tablet, and has a 7-inch (1024 x 600) displ