Apple Store offers the factory-refurbished Apple AirPort Extreme 802.11ac Wireless Base Station, model no. ME918LL/A, for $129 with free shipping. That's $51 under the lowest total price we could find for a new unit and the best price we've seen for it with an Apple warranty. (We saw a refurb with a third-party vendor's warranty for $29 less in May. It's also a current low for an Apple-certified refurb by $21.) It uses 802.11ac WiFi technology, which offers up to 40% faster transmissions than 802.11n. A 1-year Apple warranty applies.