I've only seen Scribd offering "free e-books! Just log in!" and steered clear away. Too much weird stuff going on w/ the internet. Though I just now taken a peek and they've done quite a bit of revamping!
When I read Audible's terms - 3 books a month? That's it? And 2 of them HAVE to be 'an audible original'?! Um no. The modern pricing model for anything is subscription-based now and my pockets have holes in them or something.
I've been finding more and more audiobook oferings on my various local county library websites. Ebooks too, but not a massive selection.
I also buy a kindle book on sale for $.99 (out of sight out of mind for this reader!) and for $7.49 upgrade to get the Audible. Or find a prior e-book I purchased had that same offer to upgrade - and audio is the only I can get through books at the moment. It works.
Now I'm in the confusion of how to get the audios *out* of audible. I bought them after all! That's what I'm looking up now. Or trying to.