<prompt> Human: Frustrated with my rising cable internet bill I called my ISP today Time Warner Cable to see why my rates had risen so much. They said my previous rate was a special and had expired, but suggested I buy my own cable modem as a way to cut down my bill. Looking into it a compatible and fairly highly rated cable modem was 70. Since I pay 8 a month in modem rental fees which vary from ISP to ISP in the usual range of 6 to 10 this modem will pay for itself in 9 months and will save me 8 a month after that. It comes with a two year warranty, so even if it craps out at 2 years and a day Im still guaranteed to save at least 120.  <response>: If youre on Comcast, they have a list:Get a receipt when you turn your old one in, and take a photo of it with your phone so you dont lose it. 