When choosing a school for your child, price is a big consideration but not the only consideration. Traffic, for example! It didn’t use to be such a big problem if a school you were interested in is in the other side of town, but nowadays — pre-COVID, anyway — that’s become a really big factor, especially if your kids are still really young and there’s just no way you can justify waking them up at 5 AM so they won’t be late for their class at 8:30 AM. Obviously, it also really matters what your own values and goals are: what you expect your child to get out of their school in addition to learning their letters and numbers. If you want them to form connections that could prove useful to them as adults, for example, that’s going to be something that will matter when you choose a school for them. Also, if your kids are old enough, what they actually want! And then there’s big school vs. small school, traditional vs. progressive, etc.
As for me, I’m really happy with where my son is right now, and I would say that his incredible self-motivation and his attitude towards learning, as well as his actual skills and knowledge, are truly worth our investment in an authentic Montessori education.