Groupon offers the refurbished 6th-generation Apple AirPort Extreme 802.11ac Wireless Base Station, model no. ME918LL/A, for $144.99 with free shipping. That's tied with our mention of a refurb from January and $40 under the lowest total price we could find for a new unit. (For further comparison, we saw a used one for $15 less in March.) It uses 802.11ac WiFi technology, which offers up to 40% faster transmissions than 802.11n.

A 30-day Encore warranty applies.