Transformers questions by newbies, and not-so-newbies

[Paulbot]

I'm looking at getting the new Transformers Novel, I've looked it up on the book depository and there are two entries:

a normally priced one

and a super cheap one

They seem to be by a different publisher with a different page count? what gives, is one a rip off of the other, is one a young readers edition with larger font?

I just don't get it.

One is the release from a UK publisher (the more expensive). The other is the release from a US publisher.

The UK one, with a higher page count, must have tighter margins or different font. (Or some of the data could be wrong, maybe cross check the isbn numbers on Amazon?)

It's not that unusual for a novel to be in different formats for different markets based on the publishers. Like when the first of these novels came out it was a full size hardcover in one market and a small paperback in others.

The UK one might also have all the "u"a back in words like honour and colour.