They are listed in the SCD under Major League Baseball Die-Cuts (I don't have mine at work so it might not be exact), as stated they came in sheets with no names present and the person then applied the little sticker/stamps that had the name, position, etc. was applied to the figure. They aren't too common, and can be tough if you are looking for a particluar person. Commons usually sell for $20-30 or potentially more as there are players found like this that have no other cards, which would increase demand. Hall of Famers usually sell for double or more. I know Andy Cook collects these (at least he did).-Rhett