Cable supports on the cheap...

Yes. Pretty much everyone I would suspect....

I mean, if you're willing to try to elevate the cables, just about anything would work. I know Danny at GR Research has mentioned using kids' Tinkertoys. Not sure how that would look, but again, I imagine anything would get the job done.

I bought plastic rebar chairs for 20 cents each and hot glued them to 4" squares of wood.  I also bought steel rods from Amazon and bent them and poked them into the same squares.  For heavy cables you will want bigger squares.  But I've never heard a difference with mine or anybody else's cable lifters.   You can come up with reasons why they should work including vibration, static, capacitance etc. etc.. but I hear no difference with or without them

Thr cables should sit on a means of suspension like a rubber band or damping material like thick sealing foam tape.