As long as you own your ISBN number, you can use the one you currently have. If your book was published as a CreateSpace imprint—or if you selected CS’s extended distribution—you will need to purchase a new one as the ones supplied by CS are not valid outside of Amazon. If, however, you purchased a universal ISBN through CreateSpace, you may use that number.
If you do not own an ISBN, you can purchase one at a discount directly from Bowker for $125/per (you can find more information about ISBNs here ).
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