There is no better way to learn about drones and robots than building, assembling, and programming your own. The Kitables Mini LEGO Drone Kit comes with everything you need to build your own racing quadcopter. It can be assembled in 30 minutes or so.
The kit comes with 4 motors, propellers, USB charger, zipties, rubber bands, LEGO parts for the drone body. Costs under $55 at this time.