Last time I bought audiobooks I got them from Downpour which included DRM-free downloads as either MP3 or M4B files, in addition to listening through the website or app. I believe Libro.fm may also offer this. Most of my ebooks are through Kobo and are DRM free as well.
Does depend in some cases on the publisher.
Pierre Poilievre, leader of the conservative party and our version of a Trump wannabe.