I haven't find that one in M?xico... But I want to buy it. I've heard many good critics about the Elvis '56 book! As far as I know, that contains pictures never seen before.
I'm sorry for not helping as much as you may need but I guess it's a great idea buying the '56 book. I love 50s and having more info' and pics about that year sure makes worthy spending your money in one book.
I absolutely would buy the Elvis '56 book.