Amazon offers the Netgear DOCSIS 3.0 Cable Modem for $39.99 with free shipping. (State Street Deals via Rakuten charges the same.) That's the best deal we've seen since Black Friday. (It's the lowest price we could find by a buck, although most stores charge around $60.) It features data transfer speeds of up to 340Mb/s and is certified for Comcast Xfinity, Time Warner Cable, Cox, and Charter, among others.