TigerDirect Business offers the refurbished Netgear DOCSIS 3.0 C3000 Cable Modem / 802.11n Wireless Router for $29.99 with free shipping. That's $54 below the best we could find for a new model. It features two Gigabit Ethernet ports and WPA/WPA2-PSK encryption.

Note: A Netgear warranty applies, although it's unclear for how long.