I'd call a chain link fence supplier, not too odd a length for fence posts.
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Mid city steel in Westport mass. They will deliver it to you. If they won’t, you can have them deliver it to my studio and you can come pick it up. Posted from my iPhone/Mobile device
A thought. Buy a 10’ length, a coupling and another piece cut to get the size you need. Bury the coupling so it looks less jankety Posted from my iPhone/Mobile device