Any salvage places near? We have a steel supply that buys 'drops' from industry. Anything under 4' is sold by the pound. But they have long to full length stock as well. Just an example. Very little steel isn't recycled and you can find just about anything if you're willing and not way out in the country.
But you might need new for reasons and that won't help you. Also, doesn't HD, etc. only carry 10 footers? For 21 feet go to the plumbing supply. They'll cut but it will cost you. Electric supply will have lots of 2".
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