DJI Official Store via eBay offers the factory-refurbished DJI Phantom 3 Professional 4K Quadcopter with 4K Camera, model no. CP.PT.000181 for $579 with free shipping. That's tied with our December mention for a refurb and $220 under the lowest total price we could find today for a new one. This quadcopter features a flight time of 23 minutes per charge, 4K video recording, 12-megapixel camera, and 3-axis gimbal. A DJI warranty applies; the length of the warranty varies by part.