Realcent.org

Scrapped 660 pounds of cast iron old radiators out of a church, probably 80 years plus old.
I was pleasantly surprised to obtain 4.5 cents per pound or $29.70 instead of paying landfill fees.

Take what you can get!

If they're in good shape, they're worth more as working units. They can take a long time to sell, though. One yard I frequent sometimes has them for sale.