What do you mean it jacks up your high speed internet cost?

That shouldn't change? Unless you had under 20-25mbps. Do you have Xfinity (Comcast as an option)? Even low-end AT&T options will run most all you need for 1 or 2 tvs. Now, if you have a big house that may be an issue with the wifi in the house. So, you could need extenders or repeaters; or a Google Mesh network.