The guide is going to be cheaper to order from Amazon even if you have a Gamestop rewards card and buy the pair together.
In other news, Game Informer magazine did a review of the game. They gave it a 7 (which is a bit disappointing of a score for me). Reviewer said that the battles can get very overwhelming and very frequently. I take it with a grain of salt cause this is the magazine that is published by Gamestop and they are all about fps and sports games as well as highly recognized titles. Ni No Kuni has flown under the radar by all but the most interested gamers so far and, as such, I dont think they are going to try to "push" the game as much as AC III or the latest bullshit Call of Duty installation.