DJI through ebay has the Refurbished DJI Phantom 3 Professional Quadcopter with 4K Camera, model no. CP.PT.000181, for $549.99 (regularly $699.99) with Free Shipping for a limited time.

The DJI Phantom 3 Pro is easy to fly and features 4K video and 12-megapixel photos, Live HD View, Dedicated Remote Controller, Powerful Mobile App, Upgraded Battery Charger, and Vision Positioning for Indoor Flight. It comes with a 1-year DJI warranty.