http://mlb.mlb.com/NASApp/mlb/mlb/video/dd...ll.jsp?cat=ps05
You can download all the Sox post season games right here for a mere $3.95 apiece. I've downloaded a couple of games (ALDS #1 and ALCS #5)
After you download them you can burn them to a CD and watch them on your computer. The quality isn't exactly great, the pixels are spread out a bit when you go full screen, but it's defnitely passable or adequate to watch.
Also the games are unedited, THE COMMERCIALS ARE STILL IN THERE! I guess the advertisers offset the cost of the games.