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To sell a book through retailers an International Standard Book Number (ISBN) is necessary. And the printed format needs a bar-code too. You buy both through the Bowker website, But many book distributors/aggregators, including, Smashwords and IngramSpark also offer ISBN for free when publish with them. IngramSpark, also, provides a free bar code with their free book cover template. Each format of a title is required to have its own ISBN. Meaning if a title has been formatted for print, e-book, and audio three separate ISBN are to be assigned respectively.

The Bowker ISBN Packages are as follows:
1 ISBN option $125
10 ISBN option $295
100 ISBN option $575
1000 ISBN option $1500

Note: ISBN are not necessary when publishing an e-book directly to Amazon Kindle Direct (KDP), Barnes & Noble (NooK), Apple (iBook), Kobo Books, or Google Play Books

Pre-Order Companies
back Apple Books Amazon Kobo Barnes and Noble Google Play IngramSparkPublishDriveStreetlibSmashwords
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