AltaTac via eBay offers the Unlocked Apple iPhone 5S 16GB Smartphone for GSM Networks in Silver or Space Gray for $599.99 with free shipping. Although we saw an open-box model for $49 less last month, it's still the best price we've seen for a new, factory-sealed unit and a current low by $50. It features an Apple A7 processor, 4" 1136x640 Retina display, 8-megapixel iSight camera with 5-element lens with f/2.2 aperture, True Tone flash, and 1080p video capture with 30 fps video shooting (120 fps shooting at 720p slow motion playback), 1.2-megapixel FaceTime HD camera, Touch ID fingerprint reader built into the home button, M7 motion coprocessor, 802.11n wireless, Bluetooth 4.0, and dual microphones.