I tried a couple of times to find certain audiobooks, but seldomly had luck. There just does not seem to be a place that sells digital versions of audiobooks, similar to how bandcamp sells music.
And even putting on my eye patch and throwing out my fishing net I was not able to find a place to get them.
I do not want to use a subscription service, especially if it’s part of amazon.
Therefore it seems buying a CD and ripping it is the only option left.
audible still lets you download files from their desktop site. i use various services to decode them
I usually use audiobookbay.
Spotify has surprisingly many audiobooks (at least in Germany).
In case you want to play them someplace else, you could download them with zotify.
believe it or not, the original best audiobook torrent site demonoid is still around. the variety isn’t as varied as it used to be but it’s probably one of the best public aduiobook torrent sites around.
In addition to all the suggestions everyone has put in, check your local bookstores. My local Barnes and Nobles regularly stocks audiobooks (or did, I’m not allowed in book or tech stores without “adult” supervision anymore :), both in audio cd as well as mp3-cd. If they don’t have what I’m looking for, often they can special order it. Just have to ask.
For me though, Audible is cheaper. I’ll buy the books, download them and strip the drm off.