It was a bitch to locate some aluminum 3" piping but I finally did at a local place here called Titan Trucking. I was told that the piping will be cheap as they're one of my corporate customers but I don't know how cheap. Once I get some and try one, I'll sell people some pieces at my cost + shipping if they want to make their own. Spent like 4 hours today calling around and driving around trying to find some here in Spokane. Other people might be luckier in finding some...PM me if you're interested and I'll see if I can get a whole sale price..