The SR-71 was a spy plane of the A-12 family, which was designed and built in the fifties and sixties by Lockheed's Skunkworks. It's the fastest manned plane in human history, and for me the most amazing object made by the hand of man.
How much the budget to build this? I think it is much costly. I preferred all the money that contribute to this plane is suggested to be a charity to the person that are right to have it.