Home School For Grade School Stuff.
Bastiat Free University is a home school for thinking adults, and those that want to think like adults.
At the excellent Kauffman Foundation entrepreneurial site I found and excellent piece of business simulation aimed at grade school kids. This is from a collaboration between Kauffman and Disney, it is simplistic but fun. It is called Hot Shot Business, if you have kiddos, give it a try. This is not just for home school, but is cool for any kid.
When my kiddos were young we played a business simulator with robot manufacturing. I think it was based on a Wharton B school program. The kids loved it for a while, house bots and sentry bots etc., but they soon learned to beat it.
Take a look, give it a try.