Amazon has updated their Free Whispersync title of (whenever-we-think-to-update-it)*. It's a repeat, though. To get "The Wonderful Wizard of Oz" by L. Frank Baum you'll need to first get the Kindle version
here, then get the Audible version
here. It'll last... however long it lasts.
Enjoy!
skinmaan
Your audiobook bloodhound
* In case you wonder where I got the title, I was inspired: