Timothy
Head Chef
You can buy raw stones also. I see them for sale on the Rock Hound websites. Not sure what the prices are. I'm sure it varies quite a bit depending on types and where you order them from. Part of the fun for us is to pick them ourselves and see what they turn out like. Adds to the sentimental value of the finished products, especially if you make things out of them....fun stuff...
They do sell "River Rock" in large bags at Home Depot. I wonder what some of those would turn into after tumbling? Have you ever tried any of those?