It's really hard to say. It varies by region. I'm in Southern California, we have a lot of rust free parts here, so they might be worth less than to somebody back east where stuff rusts out. There is a guy on Craigslist right now, he has a 42-47 hood and 2 good front fenders for $150, and it's been there for a few months. Body parts are where you'll see the most variation.
Glass honestly doesn't have much value as replacement glass can be cut by a local glass shop for cheap.
I had 2 '40 doors shells, some dents, no major rust, had them at $150, no takers.

 

i was at a scrap yard here in eastern canada,and the guy though he had gold. alot of new parts are really cheaply made.