I am also looking for information for a friend who has a homeschool co op.
Over the last few years, the interest in our product as a learning tool has been growing. We do not have information geared towards writing or finding grants to purchase our product. However, we have heard from other schools that there are grants available through PTA and teacher associations, as well as from the state and other agencies.
There are several other discussions on this subject that you could find some good tips.