In LA the Yeshivish school (Toras Emes) is about $18,000 per student with some discounts for multiple students. The more “modern” type day schools are over $20,000 (Yavneh, Hillel, Maimonides).
The high schools are about the same with the largest “modern” high school topping out at $25,000+.
Scholarships are available to families in need and it seems no one is turned away for REAL financial need, but they do want to know what you spend your money on.