$25 to $50

Explore the dynamic world of mechanical engineering with this hands-on kit! Build 20 projects like an elevator or windmill, then conduct 22 experim...

Explore hydraulics, pneumatics, and robotics with your very own giant hydraulic hand! Using over 200 plastic pieces and piston tubes filled with wa...

Unleash your inner cyborg with the Mega Cyborg Hydro Blaster! This buildable, handheld water blaster and claw allows you to explore the world of hy...

Finally, an adorable robot! When kids assemble the 172 pieces, they won't realize they're learning about gears, motors, and sound sensors. They wil...

Grab your beakers and test tubes and step up to your special laboratory station for some exciting chemistry experiments. See how much fun chemistry...

Bring snow inside... any time of year, no matter where you live! Kids enjoy the magic of cool snow-based experiments and learn about weather along ...

Set the planets in motion with a flick of your wrist! Build a mechanical model of the solar system including the sun and eight planets (also known ...

Indulge in the tastiest game of pinball with Pinball Machine Maker: Gumball Rally! Assemble your machine, place the obstacles, then aim and shoot e...

Experience the future of transportation with RoboRails! This compact robot uses a fast-moving internal gyroscope and clever ball-bearing weights to...

Bring science to life with the Saltwater Fuel Cell Robot! This charming, battery-free robot uses salt water and magnesium to power its steps, demon...

Jumpstart your study of mechanical physics by learning all about simple machines and how they're used to make complex tasks easier to do. Through 2...

Build unique robots that are powered by the sun — batteries not required! Using a compact solar panel, these cool little bots harness energy from t...

Make STEM learning fun with SolarBots: Cosmic Explorers! Assemble 5 solar-powered robots with the easy and colorful building system and step-by-ste...

How cool is it that the mainspring stores energy, then converts it to motion? Discover the physics of potential and kinetic energy and the inner wo...

Unleash your inner detective with Spy Labs' Forensic Investigation Kit. Uncover hidden secrets with UV light, fingerprint powder, pH test strips, a...

Create a secret alarm with Spy Labs Invisible Tripwire! Turn on the LED beams, line them up, and make an invisible barrier. If someone crosses it, ...

If you're raising a future Sherlock Holmes, your young detective needs all the tools of the trade. Help them crack the case on any mystery with thi...

If you're raising a future James Bond, your young secret agent needs the high-tech help of a location tracker. Hide the transmitter with a valuable...

Stay connected with your fellow secret agents with Spy Labs: Spy Walkie-Talkies. With a range of up to 1.5 mi/3 km unobstructed and 0.5 mi/1 km wit...

Discover the ultimate spy kit with Spy Labs: Ultimate Spy Sleuth Master of Surveillance! Use night vision goggles to see clearly in the dark with f...

Unleash your child's inner engineer with the Structural Engineering: Bridges set from Thames & Kosmos! This 287-piece wonderland lets curious m...

Let the treasure hunt begin with the Thames & Kosmos Metal Detector! Designed for explorers of all ages, this lightweight detector finds metal ...

Unlock microscopic wonders with the Thames & Kosmos Microscope! View prepared slides or prepare your own with the 45-piece accessory set. Use t...

Turn your bedroom into your very own planetarium theater! Illuminate a darkened room by casting projections of the stars in the night sky and space...