That's a lot. It's time to let that money follow the child. One promising idea is an Education Savings Account, described thusly by Education Week:
Under the program, parents who sign up get a debit card loaded with 90 percent of what would have been the state's allocation to the school district for their child. They can use the money for tuition, textbooks, therapy, or college classes while students are still in high school—or the money can be saved and used to attend college full time after graduation.