Yes, you can own one of the six Batpod vehicles used in both The Dark Knight and The Dark Knight Rises. These are the real deal, and actually have some wear from being uses on the set. The Batpod consists of a fiberglass body wrapped around a Honda 750 engine, two 31" Hoosier tires, and a lot of fiberglass and resin to complete the piece.
Sadly, the bike is being sold in "prop only" condition, meaning you can just roll it around. But what's to stop a resourceful gent such as yourself to put the bike back in working order? Food for thought.
Anyway, the bike is currently in auction, and is expected to bring around $53,000 - $71,000.