I'm in the Florida Panhandle and about 5 years ago, I added Direct TV to the TV I watch games on. I got the Sports Pack on it along with League Pass so I get NESN and CSNNE. I get to watch the pre and post game shows as well as Sports Tonight and Comcast Sportsnet.
Other than getting Direct TV, Twitter is a great place to get the pregame news. There are several Celtics reporters including Chris Forsberg, A Sherrod Blakely, Paul Flannery,& Gary Washburn that are very good to tweet any news and pre-game updates. Also ESPN Celtics Blog and Globe Celtics Blog both have updates leading up to the game.