What do you mean by solution?
Discussion
The best way to listen/aquire them.
Audible.com or Torrents.
If you are willing to self host Audiobook Self is great
https://www.audiobookshelf.org/
Open Audible is great for removing DRM from books you buy on Audible.com
YouTube also has many audio books. You can use yt-dlp to download as mp3