Amazon offers the Netgear CM500 DOCSIS 3.0 Cable Modem for $55. Clip the $10 off coupon on the product page to drop it to $45. With free shipping, that's $5 under our mention from three days ago, and the lowest price we could find by $15. It supports 16 download and four upload channels with speeds up to 680MB/s. It's certified for Comcast Xfinity, Time Warner Cable, Cox, and Charter, among others.