Here in central Texas, they seem to run $4-5 per pound, with some folks asking more. I just bought a 125# from a guy in Austin for $4 per pound. The name was illegible (maybe when I clean it off...), but he also had two 150# Peter Wright's for the same price. All of them (including my smaller one) had about 90% rebound when I checked them, so I went for the smaller (easier to more) one. It was also in the best shape (horn, edges, and plate) of the three.
For reference, he also had some leg vices for $200. I'm thinking that is probably reasonable since it's local and doesn't have to be shipped. Two of them were inoperable, but looked like it wouldn't take much to fix (threads seemed good)...should have offered him $100 for those, but didn't....maybe next time.