But $100/month adds up. According to CancelCable.com, it's like buying a new 50" tv each year and tossing it in the dumpster. Yikes! But you can cancel your cable and still watch most of your favorite shows for free from various other sources which CancelCable can teach you about.
Seriously, head on over and just think about it. And think about what else that money could be doing for you instead if you invested it instead of throwing it down the drain.