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: Avoid third-party "discount" resellers. While they may be cheaper, they often list themselves as the publisher, which can cause serious ownership and distribution issues later.

Buying in bulk significantly reduces the cost per number. ISBNs , so many authors buy a 10-pack to cover different formats (eBook, paperback, hardcover). Total Cost Price Per ISBN 1 ISBN 10 ISBNs 100 ISBNs 1,000 ISBNs (Data source: Bowker MyIdentifiers) Buy ISBNs | Bowker | Identifier Services buy isbn numbers

: Purchase via the official MyIdentifiers site managed by Bowker. : Avoid third-party "discount" resellers