While I am still looking for other viable alternatives, these two are the most prevalent so far. Other conversion sites don’t seem to have compatibility for eBook publication. However, they might still help you save some money from paying a “professional” to convert the files for you.
Michael has been a freelance writer since January of 2012 and has contributed to a long list of blogs throughout his career. He is also a published author and continues to help other writers find their own paths. Maintaining both the WriterSanctuary blog and YouTube channel, he covers topics that relate to writing in all forms.