First post here. I made a few circular cages with concrete mesh a few years back, and they worked better than anything for sale. But I didn't care for the rust, and they took up a lot of storage space. Those are the only downsides to the concrete mesh. If you need a lot of cages, there's no better value.
Last year I made simple A-frame trellises for my tomatoes and cucurbits in stock tanks, using galvanized cattle panels. The wire is a heavy 4 gauge, and at $20 per panel they are a great option if you just need a few cages. I am making both square and triangular cages this year that can collapse flat for storage. They are 50"x16' panels, so I cut them in fourths in the parking lot to transport home. That gives me 25"x8' sections to work with.
I used zip ties to join them at the top (the "hinge"), and also where they meet vertically. This year I'm using hog rings instead.
They worked great last season, although I did have to tie vines to the trellis initially. I left some suckers on the plants, and they completely covered the bottom 2' of the trellis by mid-season. I like the simplicity and stability of an A frame, and I'm going to try a few more over smaller sub-irrigated containers this year.
Oh, and despite the photo I do not recommend even tiny-fruited cucurbits sharing trellis space with tomatoes. Never again...
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