Buy via eBay offers the refurbished Apple iPad Air 128GB WiFi + 4G Tablet in Silver for $399.99 with free shipping. That's $100 under our mention of a new unit from three days ago (still available) and the lowest total price we've seen in any condition. (It's also $100 under the best price we could find for a new unit.) It features an Apple A7 1.3GHz processor, 9.7" 2048x1536 Retina display, 5-megapixel rear-facing iSight camera, 1.2-megapixel FaceTime camera, 802.11n wireless, Bluetooth 4.0, Lightning connector, up to a 10-hour battery life, and iOS 7. Deal ends May 11.

A 1-year warranty applies, but it is unclear who backs it.