I have the new 4K X1 DVR box for my main viewing TV. But I have two other TV's that see limited use and I just rent the little set-top converter box. I am paying $152/year (including tax) for those two converters. Are similar units available for sale? What about the $40 iView box?
The only cablebox you can purchase and use with Comcast is a Tivo.
FYI, the iView is not a cablebox. It is a streaming device which you can use.