Here is another educational robot designed to teach your kids a thing two about technology and engineering. The Krypton 5 Modular Robot comes with 705 parts, 6 attachable face bricks, 14 sensors, and 6 actuators. It also comes with block-based, flow-chart, and other programming apps.
The Krypton 5 robot comes with ultrasonic, touch, grayscale, position, and other necessary parts. Sets you back under $500 at this time.