Building mine was really time. My dad is a retired bridge contractor so the metal I already had, found some casters that were lying around and then went to a scrap yard to get a larger pipe to sleeve the 2.5" pipe so the piece could turn. Much like a gate hinge is how we built the ends. I had $1 in mine total from the piece at the scrap yard. Like mentioned above with metal being high I would check prices. Materials may be close to buying one.
If you have materials and want to save money I think anyone can build one with a welder and a few tools. It took us around 6 hours to build.
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