if you really want to keep cable, call them up, follow the prompts to cancel your service. you'll get a customer retention specialist, give them a sob story how you can't afford it any more, they WILL do what they can to keep you, it may be just giving you the current promotion. i had promotion of HD digital cable with HBO showtime and stars for $69.99 i had that for a whole year, i added dvr service to it, plus they also gave me internet for $24.99 a month. after that i went to a different promotion they had.
my bill was about $100 a month
you can keep calling up and getting promotions, most people don't know it. at worst they will make you wait 3 months between.
also when i say i had the service for a year, originally it was 6 months, then they called ME up and offered me the same deal for an additional 6 months.
my promotions ran out and i realized that for the amount that I watched it wasn't worth it to me, even the promotional rates, that why i dropped it.
remember two things, it is cheaper for them to keep existing customers than to have to replace them. and second alternatives are really eating into their market share so they have to be aggressive with pricing, and you usually have to call to get them.
in fact i dropped comcast cable altogether and they still offered me a lower internet service only price just to keep me. I pay $30 a month for 16mps internet only service.
personally im happier with my antenna and HTPC but if you have to have the cable service there is no reason you have to pay that much.
"If the world didn't suck, we'd all fly off."