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Just find what you can for used materials, check marketplace for used pvc. If you can find somebody getting rid of their deck just ask if you can use the wood. I built my setup without having to drop a dime.
I throw this link as a reference anytime I see any of these threads. I built my setup about 7 years ago basing it on this thread besides using pallets to cut costs on lumber (still stands strong/works). PVC can be easily found on Facebook, Craigslist, etc marketplace listings.
i got this pvc tube at a gas station because i asked if i could take it and they said sure lol, when theres no snow i just use that wooden box to slide on the rail, astroturf works real good at the end too, some slush or soapy water helps too! go around construction sites and shit and search for some pvc my man! worst thing they say is no .... or just "tactically acquire" it as we say in the army haha