i use regular old field fence with t posts about every 12'.
i got a bunch used & purchased some. if i recall right its
about $90 for 330'. years ago i made round cages out of it
for tomatos but now i dont bother. i set the "fence" along
the tomato row and weave the plants.

I bought cattle panels from scrap metal business for scrap price. Have also got dammaged ones from local farm and fleet store.

Has anyone tried the plastic type snow fence they use on construction jobs. It would be light to use but may sag to much.

I made a pvc hoop and put 2 x 4 mesh on it (not my first choice, I was recylcing freebie material). It worked well until it got overloaded and started to sag. Next year I'll use thicker pvc, schedule 40, and maybe just use parallel wires to avoid having fruit trapped above the mesh. It was great to have the fruit hanging in the tunnel for easy picking.