Most folks have probably already noticed this, but several of the books that are free right now (and for a bit more than nine more days) as part of Kindle's World Book Day promotion, have companion audiobooks for $1.99 each.
Info in this thread:
https://www.mobileread.com/forums/sh...d.php?t=346228
And there are various versions of this promotion in several countries around the world - there's a little drop-down list in the top middle of the page...