Sphero's New RVR

RVR is Sphero’s revolutionary take on the programmable robot -- drivable right out of the box, packed with a diverse suite of sensors, and built for customization. RVR is a hackable mobile platform for beginners, educators, students, and tech hobbyists.

IEEE Spectrum has it covered well in "Sphero's New RVR Robot Is More Hackable Than EverRVR is rugged, affordable, expandable, and easy to program" by Evan Ackerman.

Sphero RVR is on Kickstarter now for $199 ($250 retail), with a promised delivery in October of 2019. The Kickstart page has tons of info.