Wow, can't believe I lost everything I just typed because a pic was too large!
Have you guys ever considered Concrete Reinforcing Wire (CRW) to make REAL tomato cages? Buy & make once & they last FOREVER! I'm not ready to retype everything all over again but will try to post some pics. You can make round cages, triangular cages with a plant in each corner, "pens" or stalls, etc. You can cut the bottom wire certain ways to use as prongs to stick in the ground or even extend height. Typical height is 5ft tall. Usually available in rolls 5ft x 50ft or 5ft x 150ft, or sheets 5ft x 10ft. Some of it in my pics are galvanized sheets. The wire can be cut best with $10 Harbor Freight bolt cutters, though some use 4" grinders and some use linesman's pliers. The wire is 9 or 10 gauge (around 1/8" thick) and openings are 6x6" to reach through easily.
Hope this helps.
P.S. Those 3-ring cheap hardware store cages are only good for dwarf plants and especially good for pepper plants... that's about it.