RTH - www.rocktumblinghobby.com

   Has a great message board that covers ...well, rock tumbling and other areas of rock collecting.

 

Artfire - www.artfire.com

    My preferred selling venue (go figure)

 

The Rock Shed - www.therockshed.com

    Where I get my tumbling supplies - great service, great prices.

 

Etsy - www.etsy.com

   A low cost site for selling and buying handmade goods, mmm, like polished rocks and jewelry.