Apple offers its factory-refurbished Apple iPad Air 16GB WiFi + 4G for AT&T in Silver, model no. ME997LL/B, for $319 with free shipping. That's $60 off and the lowest total price we've seen for a 4G-capable factory refurb with an Apple warranty, although we saw an unlocked refurb without an Apple warranty for $100 less two weeks ago. A 1-year Apple warranty applies.