Not the best price we've seen, especially the price error $399, but for realistic obtainable deals, $639 seems good.
249 g Ultralight
30-Minute Max. Flight Time
3-Axis Gimbal 2.7K Camera
4 km HD Video Transmission
Vision Sensor + GPS Precise Hover
Simplified Recording & Editing
Don't forget to grab DJI Care for $59 before activation or within 48 hours of activation if you want that extra insurance (cheaper than the eBay bundled one).