As one of its daily deals, Woot offers the refurbished Motorola Surfboard DOCSIS 3.0 Cable Modem, model no. SB6121, for $39.99 plus $5 for shipping. That's tied with our mention of a refurb from a month ago and the lowest total price we've seen. (It's also $20 under the best price we could find for a new unit.) It features support for IPv4 and IPv6 and enhanced network management. A 90-day Motorola warranty applies. Deal ends today.