DJI via Newegg offers its factory-refurbished DJI Phantom 3 4K Quadcopter with 4K Camera, model no. CP.PT.000181, for $599 with free shipping. That's $180 under our May mention of a new one and $178 below the best price we could find for a new model today. This quadcopter features a flight time of 23 minutes per charge, 4K video recording, 12-megapixel camera, and 3-axis gimbal. A DJI standard warranty applies, which ranges from 0 to 12 months depending on the parts in question.