If you're doing that you might prefer to output to opus instead. Speech compresses well so you get the benefit of smaller files and have more space for other media. Just replace name.mp3 with ..." -c:a libopus -b:a 24k name.ogg"
Yes, I'm usually strongly opposed to lossy transcodes, but for portable listening of speech heavy content on a space-limited device, that plays Opus easily, it can be a worthwhile trade-off for many.
I'm using Libro[0], which is essentially a DRM free Audible (including the membership!). It's a bit of a hassle to sign up without a North American Credit Card (you can only buy their membership with one, but you can gift it with a CC registered anywhere else, so I gifted myself one).
It lacks Audible exclusive titles (which are shockingly many!), though.
Before that, I used to strip the DRM from my audible books (easily doen using ffmpeg)
Downpour.com sell DRM-free audiobooks, but lately I noticed a couple of titles in their library that are DRM-protected, so I don’t know for how long that will last.
In their library I did find most of the titles I was interested in, selection is good, content is high quality, so I've been enjoying it.
