Amazon is running a one-day sale on a variety of STEM toys, encouraging kids to explore the increasingly important worlds of science, tech, engineering, and math. There are some big-name products in the sale as well as some all-time low prices that you won't want to miss.

The popular Sphero SPRK+ educational robot toy is down to its lowest ever price at $87.49. You'd have to go back to March for the last time it went sub-$100 and we've never seen it go below $90 before. It is a programable robot that can be used in interactive games that get kids coding without them even realizing. The app-controlled Sphero Mini is also down to a record low price at $35.

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Step-by-step instructions guide kids through building fun inventions, like a voice-activated robotic gripper arm or a room-protecting intruder alarm, in the $70 littleBits Base Inventor Kit. All manner of K'Nex sets get kids building everything from rollercoasters to bridges to DNA. And the Thames & Kosmos Sensors Alive kit brings physics to life in an interactive game that links in with your iOS or Android device.

There's much more to the sale and too many items too list, so be sure to check it out in full. May of the toys are down to their lowest ever prices and will make for great holiday gifts.

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