Amazon itself doesn’t charge any fees to self publish; instead they hold a proportion of your earnings each and every book you market. So your only prices are These related to enhancing, formatting, and cover design for your book. Royalty rates for self publishing with Amazon KDP range from 35% https://maplepublishers.com/blog/what-support-you-can-avail-of-from-maple-publishing-when-self-publishing-a-book/