Comcast Service for Non-Cap Bandwidth

NANOG List, I am developing streaming video service, and seek your feedback... I would like to pay Comcast forward so that accessing our site does not count against user's bandwidth caps, similar to the arrangement made with Microsoft Xbox. Does anyone know the name of this service? Is it something the sales contact at http://as7922.peeringdb.com/ can provide? Thank you for your time. Sincerely, Nabil