I had a post a while back with a link to a primer on basic economic principles for kids, which you can find here.
I want to add to that this resource, which was posted on a local hs message board. It contains four online games that deal with investing, saving, and debt. The games are made by the “Rich Dad, Poor Dad” company. I do not agree with everything that guy says, but these games look pretty good. There is also a page for “Teachers” that contains additional classroom materials.
A good foundation in economics is so important for our children’s futures. Too many of us had to learn about debt and other important economic realities the hard way. But, I’m sure you already know that. 
