Bob's Pre-owned Car Mart is a special encounter in Fallout.
Overview
You stumble upon a used car salesman in the middle of the wasteland. He has a small house surrounded by junk cars. You can't actually buy a running car from him but you can find a Red Ryder BB gun from the footlocker in his office, as well as the one-of-a-kind Red Ryder LE BB gun in-between a pile of crates.