Available June 23 - June 29:
SHIVER by Maggie Stiefvater
Narrated by Jenna Lamia and David Ledoux
Published by Scholastic Audiobooks
ROMEO & JULIET by William Shakespeare
Narrated by a Full Cast
Published by AudioGO
I don't know if there are any geographical restrictions, I'm in the UK and am downloading Shiver ok. You have to download a small piece of software (Overdrive) before being allowed to download the mp3 files.
Download the books from here.