DJI Official Store via Newegg offers the refurbished DJI Phantom 3 Professional 4K Quadcopter with 4K Camera, model no. CP.PT.000181, for $539 with free shipping. That's $10 under our May mention and the lowest price we've seen. (It's also $195 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. Deal ends July 1.A 1-year DJI warranty applies.