In my search for a particular case for one of my devices, I came upon several iPad cases that are being sold, apparently at a clearance rate, by AT&T, online only. Scroll down the link I provided. I do not know how long these prices will last.
The specific cases and styles are clearly marked on their site.
Speck Candyshell and Fitted, IFrogz Luxe, Incipio, and AGBG
There are some other cases for $15.00 as well.