I was looking into this just last night, actually. I'm not with Comcast, I'm not even American actually, but I wanted to add a couple channels to our account and I went looking at pricing. For the basic crappy channels - the first 20 or so, I think - I was $25. Our roommate, by which I mean by would-be brother-in-law, controls the account so I don't know how much it all comes to, but looking at the different packages, I'd say it's got to be at least $80-100, not factoring in any discounts for bundling with internet and all that.