Those wanting to buy Mass Effect 3 and pay more than everyone else, you are to be rewarded for your initiative with retail packaging of a higher order. Novel!
In this case, the Mass Effect 3 N7 Edition includes not just the game (which comes in a rather nice box), but a hardcover art book, comic book, lithograph of the Normandy, an N7 patch (for your jacket/cap/bag), digital soundtrack, a Normandy prop for your 360 avatar (360 version only, of course) as well as a ton of in-game content like clothing, weapons and...a robotic dog.
It'll sell for $80.