snake gun
Propped at the back door of bamahouse is a very old Winchester 37 .410, purchased used for $50 bucks one afternoon after work. It was propped against a tree in a front yard with a "For Sale" sign.
Small town "Amurica", in the South, you gotta love it.
Anyhow, that old gun's sole purpose is to wallop pests, of which poisonous snakes are fairly common. A .410 is plenty, and the little 2-3/4 inch trap loads work fine too.
You may not find a nice M37, but a similar single shot .410 or 20 ga, used, should be out there for less than $100 bucks these days still.