Through their Internet Essentials Comcast is offering two free months of free internet to low and middle income families who do not currently have internet at home. Use code TRIO2020. Note that this code is only available to TRIO families (Good News, Upward Bound IS TRIO). Go to https://www.internetessentials.com/ for details.
CenturyLink also offers low cost internet and phone services for qualifying people. I am not aware of a promo code or any free internet offers though them. More details at https://www.centurylink.com/aboutus/community/community-development/lifeline.html?fbclid=IwAR3hIs_KjLvVn7hK3v8ZxHaBx2cMhZJuIcdUrlVmYlyGs4AAFklWI_NlV-4.