My wife the antique maven says 20 - 30 USD each, with perhaps a 10% price break as a set.
Like a lot of other things much depends on what a buyer is willing to go for, and where you are selling.
I don't think they would be very good for actual use, too reactive I would think, even tinned.
I wouldn't do more than lightly cleaning them, They have a nice color as they are now.