If you are looking to switch because you are unhappy with Comcast, see above for options. But if you are switching because at the end of your 2 year contract they are increasing your cost big time... just call and ask for the retention desk and tell them you want a match for the best deal for new customers. e.g. Triple play at 99/mo for the next 2 years. They absolutely will give you the same deal as a new sign up.
Comcast Deals, Offers, Specials and Promotions | XFINITY®