AltaTac via eBay offers the Apple 32GB iPad Air WiFi Tablet with Retina Display in Space Gray (pictured), model no. MD786LL/A, or Silver, model no. MD789LL/A, for $519.99 with free shipping. That's $30 below our January mention and the lowest total price we could find by $70. It features a 9.7" 2048x1536 Retina display, Apple A7 64-bit processor, FaceTime HD front-side camera, dual microphones, 5-megapixel iSight camera, 802.11n Wireless with MIMO, Lightning connector, 10-hour battery life, and iOS 7.