Or they make inexpensive A/B boxes if your monitor only has one input.
I pay a lot for cable too, but it’s worth it to me, as I assume it would be to the OP. There’s a lot of content that is simply unavailable online- like live sports, or TLC network shows, or my favorite show “The Middle”; looking at a channel guide makes it a lot easier finding something to watch than searching a bunch of network web sites and subscription services. That and if Comcast implements data caps streaming HD content 8 hours a day I might bump into them.