Comcast offers some best priced, Xfinity senior citizen discount friendly internet subscriptions in the US. The cheapest Comcast package has to be the Xfinity Internet Essentials. At just $9.95 per month, you get high speeds of 25 Mbps with a 3 GB data limit. You can upgrade to the Xfinity Performance Select plan to experience higher speeds of up to 100 Mbps, which will cost you no more than $34.99 per month.