Gravity Buys via eBay offers the factory-refurbished Apple iPad Air 16GB WiFi Tablet in Space Gray, model no. MD785LL/A, or Silver, model no. MD788LL/A, for $349.99 with free shipping. That's $69 under our refurb mention from six days ago and the lowest total price we've seen for any iPad Air with an Apple warranty. (It's also $75 less than buying a new unit today.) A 1-year Apple warranty applies. Deal ends September 15.