Here's the link to purchase the book on the publisher's site:
Also, I should be giving a few copies of this away in a fanart contest soon. I hope :) Check out my last post for info on that.
And join this Facebook group if you haven't! "Please bring us Hyrule Historia in English" Nearly 6,000 of us already agree, we want it in English! But we need more people~ The more people, the more likely they'll hear us and do it!