You may have seen a lot of this information floating around the interwebs but I’ve decided to put all of my knowledge and experience with ISBN’s here in an attempt to uncomplicate and facilitate new authors starting out.
The short answer is YES!
Some publishing platforms offer free ISBNs but I prefer to get my own. There are many shady places that “sell” ISBNs but the only official and recognized source is Bowkers www.myidentifiers.com
You should buy your own ISBNs if you want to have yourself listed as the official publisher of your work. If not the platform you publish on will be listed as your publisher and it can cause issues if you want to publish across multiple platforms with that ISBN.
Nope. Once you use an ISBN it is assigned to that book and that book only. That includes the same work in different formats. You will need an ISBN for your ebook, another for paperback, and another for hardback. eBooks thorugh Amazon will be assigned an ASIN which is not an ISBN and is not transferable to any place outside or Amazon.
That is honestly up to you. I personally rather have all my bases covered and have ISBNs for my ebooks.
On Bowker’s My Identifiers Prices are:
Those prices can be pretty steep for some and a lot of self publishers opt for the free ISBN from their preferred platform for that reason. I know I did when I first started. So if you are on the fence about where you want to go with your writing. If your self-publishing journey isn’t something you are pursuing as a career than having an ISBN isn’t necessary but I highly recommend getting an ISBN for your book if you plan to become a professional author.