EBay, Collectors, Flea Market & Antiques

If you buy any, just plunk them in a self-cleaning oven for about an hour or so and you are set to go.

Don't you find these grungy old pans that you could clean up for resale? In my neck of the woods, they go for a fair price, especially the larger ones. Anything smaller than about 8 inches in top diameter does not sell but the ones that will hold about 4 chops or a steak go like hotcakes at about 25 to 35 $$. The bigger ones in which you could cook a roast or chicken are very popular.
Things like the deep pans sell for more, especially if they have the covers. Commonly called chicken frying pans, they are good for anything and help retain spatters. I don't fry chicken but I use it for all kinds of things.
I also have a glass cover for one of my old Griswold pans. Hard to find!

I think I just have a 'thing' for old cast iron. I feel I must bring them back to life. The one I just bought, according to my research is about 100 years old and now looks like new!