Check out The Log Cabin in Lodi, OH. They have a .32 caliber black powder shotgun.
check out: SHOTGUNWORLD.COM
There are numerous newly made folding single shot 24 and 32 gauge shotguns on Gunbroker.com. I think the cost is under $200.00 for these.
Not published in any reference.
They are called BT-99 shotguns
George Worthington was a hardware store in Cleveland, Ohio, from about 1890 to 1935. Single barrel shotguns were marked with his name by Crescent Arms Co and double barrel shotguns by J. Stevens Arms Co.
go to gunbroker.com and you'll see all you can handle.
Thompson Center should be the company that you are looking for.
100 to 150.00 dollars in good condition.
Numerous companies in many countries have made single shot 12 gauge shotguns.
Double barrel shotguns manufactured by Crescent Fire Arms and single shots by W.H. Davenport Firearms for Wallace hardware, Morristown, Indiana, c. 1900.
on a single shot barrel you must remove the barrel and look at the flat side underneath the chamber to see the choke stamping.
See www.chuckhawks.com Fox shotguns
Revelation was a brand sold by Western Auto stores and made by various manufacturers.
Single shots, $50-$75. Double barrel, $150-$250.