The DJI Phantom 4 has obstacle avoidance and some smart tracking features, but if you just want a flying 4K camera for not much money, the Phantom 3 4K is down to $499 today, the best price we’ve seen, plus no sales tax outside of New York.
Not to be confused with the Phantom 3 Professional, the Phantom 3 4K is basically the Standard, but with a 4K camera and an indoor positioning system added on. That means it doesn’t include DJI’s LightBridge range extension technology, but you should still be able to control this thing from over 1,000 feet away in most conditions.