Id decide on the size (Diameter cup your going to use and buy a 10' length) and cut a bunch off cylinders off of it.. Here is a example of a 8" diameter... Of corse the smaller the diameter the cheaper and vice versa.
I found up to 12" diameter and down to 1.5"...
https://m.lowes.com/pd/Charlotte-Pip...-Pipe/50152524
6" too
https://m.lowes.com/pd/Charlotte-Pip...-Pipe/50152546
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