Well, (Merry Christmas by the way, I'm up letting dogs out)
I'd say, NEW they start around 45,000lbs,for a non big three, London made, best, shotgun.
USED,(and Don Amos has followed this very precisely), a Big Three, sidelock,Best quality, used, not abused, starts at around 20K.
You could look at any of the English auction houses and get a quick handle on current auction results.
Many makers have shotguns somewhat started available to be finished to your specifications. It cuts down some of the lead time.
Based on world wide economic growth right now, they should all be doing good, and prices will reflect that, as well as lead times.
But for me, at less than 20, you would have to be looking very closely at all kinds of minutiae to keep from buying someone else's discard, and would be "settling" in some regards.
