Ornamental iron is VERY expensive even if you finish AND install yourself. Shopping around is advised but you still may recoil from the price!
With construction the way it is right now though you might find an ironworker or structural fabricator (people not normally into ornamental iron) that might work with you. If they are in the business (ornamental iron) then even the "good deals" will be pricey. If you get desperate I can fabricate it for you if you have a drawing and materials. Of course there's the shipping.