Accidentally Searched For a “Rock Tumblr”

“Basically, there are two ways you can go about buying a rock tumbler. You can pick up the standard educational-toy model online or at most toy stores or you can get a hobbyist/professional model. Which to choose? Anything to watch out for? Preparations to make? Read on…”
 — Are YOU ready to rock (tumble)!? Once you get them all shiny, what will you do with them? Put them in this.