JemJem offers the refurbished Apple iPad Air 2 128GB WiFi + 4G Tablet in Space Gray, model no. MH312LL/A, for $469 plus $1.99 for shipping. That's $244 under the lowest total price we could find for a new unit. It features a 9.7" Retina display with 2048x1536 resolution, 8-megapixel iSight camera, FaceTime HD camera, and Apple iOS 8.
Note: A 30-day JemJem warranty applies.