Want to build a robot out of sheer fun, or do you want to further stoke your interest in this area? This is where the DFRobotShop Rover from RobotShop comes in, where it retails for all of just $89.99. This Arduino-compatible (ATMEga 328-based) robot will move along on treads just like a tank although don’t expect it to be anywhere near as hardy. The entire kit will come with an assembled circuit board, robot frame hardware, and a Tamiya motor gear box and tread and wheel set, where it is more than capable of toting around 2kg of gear without straining itself. You will need to have some knowledge on Arduino programming software though, where instructions will be sent via a MiniB USB cable. Powered by AA batteries, the DFRobotShop Rover might make a good play companion for your cat.