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What kind of question is that?? If you buy a book from a used bookstore, its used! If it's not a used bookstore, then its not a used book!!
barnes & nobles, library sale, used bookstore, ANY BOOKSTORE
it's called "Beat the Bookstore"
Amazon.com or a used bookstore.
You could probably get it from your local library or at a bookstore/ used bookstore. You could also probably get it online.