I'm looking for suggestions for DD8. The tricky part is that I have to be able to find the books in an audio format, preferably on CD.

DD generally prefers long books with a little magic. Her favorite is Harry Potter, and she's gone through that series many times. She thought the Lemony Snicket books were okay, refuses to read any of the Percy Jackson series, felt that the 39 Clues books were too short and simple, and enjoyed the Golden Compass. She's in the process of listening to Christopher Paolini's Inheritance series, which she likes almost as much as Harry Potter. I plan to introduce her to LOTR next, but I'm not sure what to suggest after that. I think she would enjoy David Edding's Belgariad series, but the library doesn't have that in an audio format. Any ideas?