The Muirwood audiobooks were done by Brilliance Audio and are on Audible or Amazon: http://www.amazon.com/Wretched-Muirwood-Legends-Book/dp/B00B1P0QSO/ref=la_B004SBCEK6_1_2_title_2_audd?ie=UTF8&qid=1365362794&sr=1-2

Kate Rudd did an amazing job narrating.