Truth to tell, it's just making me sad to still see pg 89 every time I check this thread. Nothing much going on in the Audiobook world I guess. So I decided to share this link just in case there are people who aren't aware of it, and in an effort to tip us over onto pg 90.
Whispersync Titles
This is all the Kindle books with WS sync "companions" sorted by the price of the ebook. That means you will see pages and pages of free ebooks which usually have very cheap WS audiobooks attached. (I haven't figured out how to sort the books, on either Amazon or Audible, by price of the audibook, sorry).
Oops, the link isn't sorted (even though the page was). So, you will just need to choose "Price: Low to High" from the drop down.