In 1971, Andy Warhol created Art Cash for a casino-themed fundraiser to support Experiments in Art and Technology (E.A.T.), a now-defunct nonprofit promoting collaborations between artists and engineers. Each bill denomination was created by a different artist, including Robert Rauschenberg. Warhol made the ones, which were printed by the American Banknote Company on the same paper used for U.S. currency at the time, sans the anti-counterfeit threading.
Fifteen of Warhol's bank notes were pulled from the estates of E.A.T.'s founder and are for sale for $300 apiece at Exhibition A, a members-only site started by Cynthia Rowley and her husband, Bill Powers, that sells affordable editions of work by leading contemporary artists. This isn't the first time Warhol has sold one dollar bills for more than face value. In 2009 his painting 200 One Dollar Bills broke records when it sold for $43.8 million. $300 a pop, Art Cash is a helluva deal.