Is this is multi-disc game (have to swap discs) on 360?
The case has two discs. Disc 1 contains all the DLCs and is an installer disc (i.e., you use it only to install the DLCs). Disc 2 is the game disc; you use this one to play the game. While playing the game, you don't have to swap discs ever. Works just like Halo 4, if you got that one.
I price matched at Best Buy with no problems (cuz I had gift cards to burn). Keep in mind they are doing online price matching only up to Jan 31st (unless your store has a different policy).
Edit: Wow. gryphter beat me by a minute...