Xfinity by Comcast is the most widely available home internet provider in Boulder, Colorado, offering cable internet service across most of the city. Plans Available in Boulder Plan Speed Price/mo Contract Connect 75 Mbps ~$30–$40 None Connect More 200 Mbps ~$40–$55 None Fast 400 Mbps ~$55–$70 None Gigabit 1,200 Mbps …