Indie authors who want to distribute and sell and e-book have hundreds of viable options. Every major online bookseller as Amazon, B&N and Kobo all have their own portals to submit content and sell it worldwide. Things are very different with digital audiobooks, which has quickly become a billion dollar industry. There are few options for indie authors to create an audiobook and offer it for sale.
Indie authors are facing insurmountable challenges when they want to generate an audiobook of their novel. Unlike writing a book, it is very hard to create and distribute an audio edition by themselves.