These sets of autographs will be auctioned in France, among others, in a couple of weeks (http://catalogue.drouot.com/indexDrouot.jsp?id=81901&lng=fr) . Most of the auction concern LPs and other vinyls discs but there are a couple of signed items.
Hmmmm I actually don't like any of the examples. I'd have to see the first one in person as the pen used for signing causes the signatures to be less distinct.