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Yeah, I went with mild steel on mine too. I paid just under $100 for 2 20' sticks of 2" square 1/8th wall tubing cut to my specs. I couldn't see spending nearly $600 for stainless.
Wow, we should probably raise our prices here at work. We sell some stainless steel tubes for soil samples, and our 1.5" x 6" tubes (.035 wall) is $1.50, so 20' would be $60. Too bad that is 40 pcs.