Not a transformer (seen other auction posts that weren't) and I'm not sure anyone is interested in this realm of collecting but here's an Artist Proof from the card set I worked on for the Captain America Movie. Thought I'd pop up this notice in case there were collectors here. Only a day left.

Captain America AP Sketch Card by George Calloway - eBay (item 120740757955 end time Jun-26-11 07:35:00 PDT)