I bought a bunch of tubing from OnlineMetals.com recently and they had 3/4" thin-wall alum 6061-T6 tubing really cheap as I recall. Just keep in mind that shipping cost take a huge jump at 96" long. So if you can get them to cut a couple of inches off it might save you a lot of money. If you are going to bend it, you'll want a different alloy. I'm sure they can recommend.
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