As part of its Gold Box deals, Amazon is offering a selection of National Geographic Science and Activity Kits starting from $14. Leading the way here is the National Geographic Rock Tumbler Starter Kit for $41.49 shipped. Normally going for $50, this 17% discount marks a return to the all-time low price we’ve tracked. We last saw this price back around Black Friday and it has only been this low a handful of times before. This kit comes with everything you need to take a rough gem and polish it down to a shiny piece suited for display. The tumbler with a 1-pound barrel is the centerpiece here with four bags of polishing grits. A detailed, full-color learning guide is included to help you along the way. Be sure to keep reading below for more National Geographic kit deals.