Just a note about cheap tumblers. I have a tumbler I bought from Harbor Freight. It only lasted two months before the rubber belt wore out from a bad pulley. Took it back and got another one. This one lasted about three months before it went south, the plastic bushings for the rollers wore through and the rollers began to eat through the sheet metal. It was costing me about $10.00 in gas to get a replacement. I decided to fix it instead. After fixing it I decided I needed another tumbler and I too didn't like the prices of the ones at the rock shop. I built my own. It has roller bearings supporting the shafts and a heavy duty small motor that I got from salvage. There were several web sites that I used to figure out how to make mine.