Ask HN: Best Affordable Hackable Drone

I am looking for a budget drone which can run neural networks. The idea is to use on-board sensors (preferably proximity sensor, GPS, accelerometer, gyroscope and Camera) to learn to fly autonomously using Deep Reinforcement Learning. I am new to the world of drones so I'm not really sure what would constitute a budget price. But I think <$200 would be a good deal.