Do you wonder about getting ISBNs for your indie-published books? It’s not too important to have an ISBN for e-books. I’ve heard of several successful indie authors who see no point in it.
However, having an ISBN does make a book seem more professional and part of mainstream book publishing. But aside from the image it conveys, I’m not aware of any tangible advantage for e-books.
You don’t need ISBNs for print books either, but I think they’re important. They facilitate ordering and tracking. Though bookstores typically don’t want to deal with self-published authors (unless you are local or have a connection with the manager), they will need the book to have an ISBN to order it and track it in their system.
In the United States, buy ISBNs from Bowker.
Note that you need one ISBN for each format your book is in hardcover, paperback, e-book, audiobook, and so forth. If an organization will provide an ISBN as part of its services, look carefully at what you may give up when you use their ISBN.