I'm a big lover of cheap shotguns. I have a 5100 made for Sears, a JC Higgins, that's fine and in great shape for $225. It's 16 ga.

For hammer shotguns, try Simpson, Ltd. They have lots of hammer Husqvarna shotguns in various conditions for various prices, most of which have pitted but servicable barrels.

Not many problems you can't fix
With a 1911 and a 30-06