Stone Lithographic painting

After seeing a Public Broadcast System TV show on stone lithograph printing, I would like to try it. There are several problems. One: stones are expensive. Two: I have no idea how to make a print using this technique. So, what do I do? I've been browsing on the Internet looking for instruction DVDs and supplies. I found some DVDs on the process, but it is about $32. That is an expensive DVD. Then again, it is cheaper than taking a college class or hiring an art tutor to show me the process. Hmmm, something to think about.