Amazon has a lightning deal on the Arris SURFboard SB8200 (docsis 3.1 cable modem) for $149 plus tax. You might also be able to use one of the $5 Amazon camera credits on this deal.
https://smile.amazon.co
(After going to the web page, click on View Offer button to get lightning deal price)
This is the lowest Slickdeals price since January.