There is no better way to master electronics and robotics than building your own robots. The ROSbot is a robot you can build with a digital camera, laser scanner, CORE2 board, DC motors, orientation sensor, and a few other components. The chassis is laser-cut from 2mm thick aluminum plates.
The robot comes with a 360-degree RPLiDAR A2 laser scanner. It is ready to be programmed. More info is available here.