Sure, you can still buy your original art online at the Sheldon Store, but if you come by Blank Label Comics' booth #1330 ( PDF of map) at San Diego Comic-Con, you can pick up that same art...for 25 fewer smackers. That's a pretty sizable number of smackers!
But! To make sure that the original art you desire is at the convention, drop me an e-mail and let me know which of your favorites to bring!
(Note: this sale price is only good at San Diego Comic-Con.)