Thames & Kosmos Robotics: Smart Machines Science Kit

$129.99 (as of February 17, 2019, 5:12 am) $69.99

This kit gives kids a simple, fun, and customizable introduction to robotics that lets them build eight motorized machines.
Requires a tablet or smartphone
Using the app interface, you can program the robots you build to behave based on the feedback coming from the ultrasound sensor.