Buy.com offers the refurbished 5th-generation (current generation) Apple AirPort Extreme 802.11n Wireless Gigabit Base Station, model no. MD031LL/A, for $99.99 with free shipping. That's tied with our March mention of a refurb and it's the lowest total price we could find by $10. (It's also $63 less than the best price we could find for a new unit.) This 802.11n wireless 4-port Gigabit router has a USB port for sharing a printer or hard drive and works on both 802.11g and 802.11n frequencies simultaneously.

A 1-year warranty applies, although it is not clear who backs it.