Jim,
I was looking for memorabilia myself a few days ago. I found what I was looking for.. however, during my search I came across a Cue Ball signed by Mosconi that was a center-piece for a hotel in Vegas. I think when the hotel closed the guy bought it at a sale. Not sure.....
Anyway, it is listed on Craigslist in Las Vegas. I never contacted the seller, so I don't have any other info, but I thought it was neat.
Just a heads up.