How much does pipe fencing cost?

I am looking into buying some property, but I would need to put up some pipe fencing to make a pasture and riding arena. So I want to consider that cost into my over all investment into turning this property into "horse property." Any rough estimates would help! THANKS|||Here in the Dakotas we're using it for corrals and feed lots. We use several sizes of drill pipe for posts and four to six pieces of sucker rod between. I haven't priced it in years, but it usually sells by the pound which is very close to the price of scrap iron. Because we're in oil patch country it's stacked everywhere around here. RScott