I have an extensive collection of R&T magazines from the '50s to the '80s, the early '60s ones have ads for perfect '57 Speedsters for $900, etc.....
It would be even sadder to look at RE listings for L.A. from the '70s or '80s. The bottom line is that nothing ever seems cheap at the time, by definition it is selling for what it's worth. What it's going to be worth later is another story, and if you could predict that w/ accuracy you'd be a billionaire and the price of cars would be irrelevant. So there you have it.