Arduino Shield Robot Kit, $120
This is a clever way to easily roboticize your existing Arduino board. Part of the popular BOE-Bot line from Parallax, the Arduino Shield Robot Kit lets you plug in your own Arduino board into the kit’s Robot Shield which then mounts onto the included BOE-Bot chassis. Once the hardware is set up, you can access the online (and now Arduino-optimized) BOE-Bot lessons online, with over 40 experiments and projects. Parallax developed this version in “MAKE blue” just for us!