I bought a Bill Large barrel on Ebay last week, 1 inch acrost the flats, 31 1/4 long and 54 cal. with a patent breach. It has never been used and is in mint condition, cost me $283.00 with shipping. Hope this gives you and idea about the cost of your's.
You ought to take the tools and barrels to Friendship IN for the NMLRA Spring Shoot. There are a lot of boys there that just might spend more for Bill Large barrels or tools than you have in them.
Bill Large was the first of the modern day barrel makers. A lot of his barrels are still winning matches today.