I think I saw it on trade-a-plane a few years ago for something like $3 million. It's such an amazing plane. I think the Air Force needed a longer range fighter/bomber to expand on the p-51's abilities, and decided that two p51's together would solve the problem. Now you could have two pilots alternating flying with twin engine reliability and more fuel since you could lift more drop tanks and the guns got moved to the middle so you had all of the outer wings to have fuel. I'm pretty sure that only the left pilot had throttle, though. I could be wrong.