Cpt. Tim above mentions the original cover of Coup's CD, which came out shortly before 9/11:

http://www.wired.com/culture/lifestyle/news/2001/09/46771

A substantial portion, if not all, of the Edison Co. film "Executing an Elephant" can be seen in the Errol Morris documentary "Mr. Death," which follow the career of Fred A. Leuchter Jr., an electric-chair engineer and Holocaust denier:

http://www.imdb.com/title/tt0192335/

Future Shock is indeed to stacks of old paperback books as Frampton Comes Alive or My Name Is Barbra is to crates of old LPs. But The ESP Papers isn't so common, and The Medium Is the Massage, if it's in nice shape, is fairly collectible.