8's are rare but they are around. There would be a price range to talk about but each gun could command more or less money depending on the merits of each gun. Ball guns might command less but probably shouldn't. The big 8s (brass case guns) are extremely powerful, unique to themselves and rare. A Holland paradox 8; only maybe 70 or less made with maybe 30, 40 or 50 survivors in various states of condition. You certainly wouldn't be undergunned for anything.