I paid 900 for my 58, and was able to drive it up on the trailer. Although, I think I stole it! It all depends on what kind of shape it is in. I paid 500$ for my 55, but it did not have a dump on it and the bed was pretty much rotten. The cab is almost perfect as far as rust goes though.
There is a guy here that has a 57 with new tires, newer wood on the bed, V-8 and a complete rust bucket! He has been trying to sell for 2 years, asking 7,000 I think.
I have seen a number of them in-between as well.
All that to say, prices around here are all over the place.