AT&T has already sold out of the new 4G iPad, reports BGR. Customers hoping to get the new iPad at the same time as its debut date will now have to wait until March 19th. However, at Verizon 4G iPads are still available to be delivered by the debut date, though BGR believes that will change soon as well. Apple’s new iPad starts at $499 and will be available to purchase in stores on March 16th.