Here's a sure-fire way to get discounts on cable TV:  the short answer is to not want it. 

Detailed steps as follows:

  1. Cancel Cable.  They actually may not try to offer you discounts to get you to not cancel, and will likely go ahead and let you cancel.  Any discount they do offer likely won't be the best you could get after you do cancel.
  2. Continue to watch cable, if desired.  It's been 10 days since I canceled cable TV and it still hasn't been disconnected.  Not that there is anything to watch.
  3. Wait for the phone call from Comcast.  They will call after 10 days to confirm that you have cancelled cable TV.  They they will do a hard sell on signing you back up for cable TV with an introductory special of the first 6 months of service at half price.  You have to say no thank you 2 or 3 times before they will realize you're serious.
  4. If desired, sign back up, and after 6 months repeat again from step 1.
Or, better yet, just wire up a digital antenna in the attic and get UNCOMPRESSED HDTV and be done with cable for good.  Sayonara!