semi 6" exhaust sticks

building a custom 6" exhaust on a semi that we swapped engines/cabs on this winter.
I've found online a place that sells 6" OD tubing that costs $18/foot. Does anyone have access/connection or knowledge anywhere that's cheaper than that?
 
No way stainless pipe is 18.00 per foot. That 4 state link says it's aluminized steel.
 
No way stainless pipe is 18.00 per foot. That 4 state link says it's aluminized steel.

i didn't pay much attention to anything else after I saw the price.
then I read below further down and then it says

6 Inch OD Exhaust Pipe Sold per Foot
* Made Of High Quality Aluminized Steel
* Size: 6 Inch OD
* Sold Per Foot

Not sure why the link says "stainless"
 
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