They are commonly called “Pawn Shop Mausers” and can very from military surplus to used consumer rifles build on Mauser Actions. Typically they can be had for pretty cheap, $250 to $400 dollars, but the condition varies quite a bit.
I bought a J.C. Higgins Model 50 Chambered in 30-06 back about 2 or 3 years agos with the intent of using the receiver for a target rifle. My interest in a target rifle has waned and I’d rather have a field gun, that I don’t mind beating up as long as it shoots.
Here’s the journey from a pawn shop purchase, to a working field gun. Who know how much work I’ll need to do and what fun mistakes I’ll make!