There are rumors that the Enterprise, the shuttle prototype that tested re-entry flight but never made it into space, might also be up for grabs. Discovery is already heading for the Smithsonian.
Also, they have so many space shuttle engines, they're giving them away! The main engines were originally going for $400K to $800K two years ago, but now, if you're willing to pick them up and put them together yourself, you can have them free!
I am mechanically inclined (my parents are constantly buying interesting exercise equipment and getting me to put them together for them. They pay me with a bag of Oreos. Considering how progressively harder each one gets, I'm holding out for Rice Krispie treats next time). Like Eric Idle said on Monty Python, "Guaranteed to break the ice at parties."