Thanks so much for this Nightbird!
-Also, here's a direct link to the 27 Free Whispersync for Voice/Audible Titles that are on Amazon US right now.
Link:
Amazon US - Free Books with Free Whispersync/Audible
-Here's a heads up - you just need to make sure you "buy" the book for 0.00 first (or already have it in your Amazon library) then click to buy it for 0.00 from Audible, each title is then put into your Audible cart and you "buy" them for 0.00, I don't have an Audible membership, just a free account and all went fine.