Ending today, DJI Official Store via Newegg offers the refurbished DJI Phantom 3 Professional 4K Quadcopter with 4K Camera, model no. CP.PT.000181, for $549 with free shipping. That's a buck under our March mention and the lowest price we've seen. (It's also $169 under the lowest price for a new one today.) This quadcopter features a flight time of 23 minutes per charge, 4K video recording, 12-megapixel camera, and 3-axis gimbal.
A 1-year DJI warranty applies.