I&#x27;d have to say your best option would be the Parrot AR Drone. It&#x27;s probably will be higher than your price range but it&#x27;s definitely worth it. I personally have one and have even programmed it to dance to music. It&#x27;s extremely easy to work with and there are numerous libraries out there for most languages. I highly recommended it, you don&#x27;t even need to modify the drone to start developing for it. I&#x27;ve built my own quadcopter and would have to say I still prefer the AR Drone when it comes to development.