Linksys offers the refurbished Linksys DOCSIS 3.0 Gigabit Ethernet Cable Modem for $19.99 with free shipping. That's $39 under the price of a new one today and the best price we've seen in any condition. It's compatible with most major cable providers and features data transfer speeds up to 343Mb/s and a Gigabit Ethernet port.

Note: A Linksys 90-day warranty applies.