dan&darci advanced professional rock tumbler kit - with digital 9-day polishing timer & 3 speed settings - turn rough rocks into beautiful gems : great science & stem geology toy for kids all ages is up for auction in Toys & Games. The current bid is $28.00, 44% below the $49.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.