Sorry you ran into this.
B&N have a horrible habit of having special promotional pages which say that a book is free, but not updating them for a couple of hours after the book becomes non-free.
So if you click a "Free" link from the aggregate promo page after the offer expires, you get charged and you don't even get the "do you really want to buy this" warning that I've heard you're normally supposed to get with pay books.
This is why I always make a point of loading up every individual book description page to see that it actually says 0.00 before I click.
I seriously hate 1-click buying, and incompetent applications of like B&N's don't help.
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