My brother and sister-in-law homeschooled their kids for a while, which was a bit out of character for them. It turned out they were actually sending them to a private school that was technically "home schooling" because the parents taught the kids at home one day out of the week using school-provided materials and the kids were at the school the other four days. That one day a week allowed the technical "home schooling" designation and also allowed the school to use non-state-certified teachers (with the added bonus of being able to pay them hourly and only for four days of work a week). And all of this was only marginally cheaper than normal private schools. My bro and SIL eventually realized how shitty this was all around and moved into a good school district - which was way cheaper than private schools.