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MINDBLOWN Motorized Rock Tumbler Set

Available at 2 stores

Best price · Macy's $29.99 $39.99 −25%

Prices as of September 26, 2026, as listed by each retailer — verify the current price on the retailer's site before purchase.

Price history tracked at Macy's price trackerJCPenney price tracker

14-day low
$11.99
Sep 17 · Macy's
Best price
$29.99
−33% vs high
14-day high
$44.99
All stores
$45$28$12
Sep 13Sep 26
  • JCPenney
  • Macy's
Lowest in 14 days: $11.99 at Macy's. Highest: $39.99. Current best is 25% below the 14-day high.

What buyers say

AI summary · 25 reviews

A fun, educational toy that transforms rough rocks into smooth, shiny gems, though many buyers note it's very loud and requires a long, messy process. The product works as intended but demands patience and careful placement.

Liked

  • Clear instructions
  • Safe for kids
  • Sturdy build

Complaints

  • Very noisy operation
  • Leaking during use
  • Insufficient grit supply
  • Lack of USB plug adapter

Generated by AI from real customer reviews at Macy's and JCPenney — may miss nuance. Summarized Sep 2026.

About this product

The Discovery Mindblown Motorized Rock Tumbler Set is a hands-on science kit designed for children aged 8 and up. It includes a USB-powered tumbler, a ribbed barrel, polishing grits, assorted stones, and a power cable. Users add stones, water, and grit to the barrel, then activate the motor to polish rough rocks into smooth, shiny gems over time. The kit supports STEM learning by demonstrating geological processes through experimentation. Constructed from plastic, thermoplastic rubber, and metal components, it is intended for educational play and promotes skills in science, technology, engineering, and math. A carrying case is included for storage and transport.

  • USB-powered motor
  • includes polishing grits
  • 6-piece set with carrying case
  • for ages 8 and up
  • promotes STEM learning
  • wipes clean

Based on 25 reviews at Macy's and JCPenney

Read reviews on Macy's

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MINDBLOWN Motorized Rock Tumbler Set — Compare Prices at 2 Stores