This is pretty cool. NASA has let Skinner auction company sell off a bunch of older official NASA prints. I really like that first one of the original 7 Mercury astronauts....but it's estimated to go for around 400-700 dollars. Ouch. Pretty high for a 9x7 picture.
http://www.skinnerinc.com/auctions/3048M
http://www.skinnerinc.com/auctions/3048M