Well, by cheap, I mean less than $15.00.
This is made from 1" PVC and netting purchased on Amazon.
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
The trellis size is approximately 3 x 5 feet and the netting fits tightly.
The netting is substantial and I expect it to last a few years. I'm going to use the trellis for cucumbers and an identical one for beans.