Comcast High-Speed Internet offers new customers $100 cash back via mail-in rebate with Comcast high-speed Internet starting at $19.99 per month for the first six months. Plus, receive a cable modem and wireless router for free. Of note, order the promotional bundle service, and earn upto $275 cash back. Tags: Cash Back, Comcast, High Speed Internet Related posts No related posts. More Related [...] ...