Place called Michaels big craft store they sell a plastic starter model, comes with everything including rocks. Been a couple years since I bought one for my cousins girl think it was around $60.00 dollars, or rock and gem shop for a better model was about $160.00. I actually liked the sound of the tumbler but the wife made me keep it in the garage. Takes 4 to 5 weeks for a finished batch. I use 3- 15 pound barrels, one for each grit and a couple small ones for the polishing but as long as you clean the barrel really good between grits they do a very good job. Just make sure you use the same hardness of rocks or the softer ones will disappear. My grand kids love to help wash them between stages. Worked In Regina a couple summers lived at the campground in White City and drove to Souris every second Sunday to collect Agate, Petrified Wood and Jasper. When I would come back all the kids would come over to help wash them and pick out some of the ones they liked to start there collections. Kids love rocks and some even had their own collections that they picked and would come to show me and ask what kinds of rocks they had. There moms and dads said they were always picking up rocks. A great hobby have fun.