Cheapest? Keltec PF9
Lowest cost? Savage MK1
Thank you.
Least expensive? My old hammerless coach gun.
OTOH, if by "cheap" you mean lowest quality, I way overpaid for a crappy, rusty, old Carcano, that somebody got penknife -happy
with on the greasy, manky old stock. My theory is the Italians thought they could win
a war by starving the other side to death, waiting for them to shoot back. I think of it as a
wall-hanger which COULD go off, if you can find some ammo for it, and are really careless.