Amazon offers the Motorola Arris Surfboard 600 Series DOCSIS 3.0 Broadband Cable Modem, model no. SB6183, for $98.97 with free shipping. That's the lowest total price we could find by $31, although we saw it for $9 less in August. It features download speeds of more than 600Mbps and upload speeds of more than 100Mbps. Note that this modem may not be compatible with all service providers.