Ned, how old is your son? What grade level?
My wife is homeschooling our four, but the oldest is just 10, and they've never been in a school system. She uses a variety of stuff, depending on the child and depending on the subject.
People who take their kids out of a school, usually like to buy a pre-packaged curriculum, since their kids are used to that sort of discipline and structure.
We've been very happy with "Math-U-See" for the math part of our schooling.
Regarding Sandy's comment. If you do go homeschooling, you may want to look into joining, or at least learning about, the
Home School Legal Defense Association. We're members of the Canadian version of that. People sometimes get "harassed" by their local school system when they pull out their kids, and sometimes misinformation is spread. This group is there to make sure you have all the
correct legal information at your hands, and they can help advocate for you if necessary.
best wishes,
...art