A '67 Datsun 510.
I didn't buy it new, but used many years later for $250. It actually ran just fine for the year I owned it, except there was a loose wire under the hood and sometimes the headlight would go off. Then I'd have to jiggle the wires until the lights came back on.
Several years ago I saw one for sale in front of a rural farmhouse. The guy wanted -- get this -- $250 for it. I was halfway tempted to buy it, but decided to pass on it. It was really a small car, and these days if I got into a wreck, that would be it.