When I built the smoker I have now I lived near the water so I went to a ship yard and bought a piece of 24" pipe for scrap cost. One other thing you can try is to locate a company that services air compressors usually their yards are full of compressor units the removed. They might be motivated to make a donation if they were influenced by the right amount of ribs (this worked for me before) or brisket. When I built the smoker trailer I have now, I made a deal to cater a party for 30 people in exchange for a travel trailer. I got the trailer completely torn down only the floor with the stove the sink, hot water heater, pump and reservoir. all because I posted an add on craigslist.com it worked out for oth of us. I just made our maiden voyage to pork in the park. we didn't win but we sure weren't last.