90%+ of soya grown is used for animal feed. Funny how those of us that eat a lot of tofu manage to find it cheap very easily, and I'm still finding new types of Tofu 35 years later... I'm in the UK, but surely wherever you are can't be that far behind the rest of the world?
We get tofu blocks in various forms from all supermarkets (Aldi, Lidl, Asda, Tesco... etc.) for about £1 per block. Equivalent meat costs probably £3-£5. We sometimes get fresh (unpackaged) and deep fried tofu from our local Asian cash-and-carry, plus various tinned, vac-packed and jarred varieties. Occasionally we get "expensive" tinned braised tofu from local wholefood shops as a treat. Occasionally we get a Chinese take-away - several of our local ones do Tofu and Seitan. Our favourite one does their vegan dishes £1-£3 cheaper than the non-vegan options.
We don't buy frozen ready meals, but vegan ones do exist. We like cooking, and cook a lot from scratch, but there are lots of jarred sauces and sachets you can get that are vegan - it's completely possible to make a quick meal with a jar of pasta sauce, a tub of marinated tofu chunks and frozen veg, and it would still be cheaper than using frozen chicken chunks instead.
It's there if you go looking for it. A vegan diet is pretty cheap in reality - about 30% cheaper the way we do it, and we're not particularly frugal about it, nor do we put in much effort to achieve it. We buy the things we like where we know we can get them, probably just like you do.