I recall many runners, some of them in decent condition, trading hands for $15 to $200. That was essentially the end of the 1960's to about late 1970's.
Some common prices were:
Early Corvairs, post Nader book, $25-$50. Endless offerings.
Renault Dauphines. $15-$40. Plan to replace regularly. Simca's, same deal.
Mid 1950's to 1962 Fords. $25 to $100. Good junkyard 292's for $15.
Very poorly maintained VW Beetles. Common as dirt, but somehow still running. $100-$250.
Earlier Studebaker Larks. A friend paid $15 for a 1960 with one cracked piston. He replaced just one piston and honed. Found an OD unit and installed. Drove it for years. It had already been brush painted orange.
I bought a '67 Ford Cortina GT with a warmed over Kent engine for $150 in 1979. A pretty valuable car today.
In the early or mid 80's, a coworker bought a very early Pinto, with 1.6 Kent engine and the big bang gas tank. Everyone was dumping them. I believe he paid $125. Lower mileage and he drove it for many years.
In about 2008, my stepson bought a 1992 (I think) Saturn SL2 with 245k mi. for $100. The seller's father had rebuilt the engine, top to bottom. After replacing struts and some brakes, it was a very good running and driving car. Somehow, it used very little oil.