Walmart offers the refurbished Motorola SURFboard DOCSIS 3.0 802.11n Wireless Cable Modem
, model no. SBG6580, for $69
with free shipping
. That's $1 less than our August mention of another refurb, $38 under the cost of a new unit, and the lowest total price we could find. The modem acts as an 802.11n access point, features four Ethernet ports, and support for IPv4 and IPv6 and enhanced network management. It may not be compatible with all service providers.
Note: A 1-year limited warranty applies, although it's unclear who backs it.