If you can't find it through cable, go to this site
http://www.myp2p.eu/competition.php?competitionid=&part=sports&disciplin...

An hour or so before game time they'll show a list of links. (Higher bitrate will have higher quality video)

Some are mirrored and will play straight through Mediaplayer, others you might have to download

http://www.tvunetworks.com/
http://www.sopcast.com/
http://tvants.en.softonic.com/download

I watched several NFL games using this site last year. The quality varies but big games that were broadcasted nationally were general pretty good.

Good luck- Go Celtics! DMM