I booked my flight out of Mpls two weeks ago. Total cost round trip, $304. Midwest Airlines, I booked through Travelocity, the cheapest rate I found on line.
As for a hotel, I can't find any in downtown Boston for much less than $200+/night. I think I'm going to book at the Howard Johnson near Fenway park. I think it was around 170. a night and is suppose to be about a mile from the arena. It's only a two star but I'm not going to Boston to hang out in my room. I found another hotel for about the same cost near the harbor, I think it was the Constitution.