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$50-100 is way overestimated. You can grow tomatoes in inexpensive pots. Seedlings are inexpensive. Maybe $15 total, plus water, time, and patience. The latter two of those can be expensive, but difficult to quantify.
Tomatoes get big. They need a decent sized pot. I would recommend a 12" pot, defintely no smaller than 10".[0] Dirt aint cheap. "Cheap as dirt" wasn't formed from shopping at garden centers with bagged dirt, and you don't need a truck load for container gardening.[1] Tomoatoes need up right supports like cages, etc.[2] Seedlings are cheap individually, but each one needs a container.[3] [0] $10 https://www.homedepot.…
I have determinate dwarf tomato plants (3 feet tall max), which I grew from seed ($2.99), planted in old milk crates (free) lined with plastic from old bags (free) and filled from one huge bag of potting mix (~$20-30), and this gives me half a dozen plants that are superior to anything in a supermarket. I staked them with tree branches trimmed from my trees (free).
I have grown them in the actual ground many years, eliminating the cost of the potting mix, but after a few years, you need to let the soil lie fallow to avoid blights, so this year it's the milk crate planters.