In the U.S. the vast majority of places have only only provider, there is no shopping around. $135/month sounds about right for the complete package. If you're lucky that includes a "special" on including HBO.
Virtually all places have "specials" on the first year of service, wherein the price will increase 50% or even 100% after the first year, which will almost always put you well into the $100+ range.
I understand. For myself, I chose to solve that by not purchasing any TV, cable phone, or any other package and only getting Internet. Internet is the only useful thing for me from all of that, anyway.
If the prices get too high I call them up and cancel. At that time, they try to keep me as a subscriber by giving me lower rates. If they don't have any available I ask when their new packages are coming out and call back a day after that time.
Virtually all places have "specials" on the first year of service, wherein the price will increase 50% or even 100% after the first year, which will almost always put you well into the $100+ range.