Not a specific recommendation, but check out Libby (<a href="https://meet.libbyapp.com" rel="nofollow">https://meet.libbyapp.com</a>), you can borrow plenty of audiobooks from your local library for free.
Lots of free scifi here:
<a href="https://librivox.org/search?primary_key=30&search_category=genre&search_page=1&search_form=get_results" rel="nofollow">https://librivox.org/search?primary_key=30&search_category=g...</a><p>You can find some really good classics in there. The reading is not always very good, but it's free.