If you are looking for older, more classic books, librivox has many audio recordings available free of charge. I have too few posts to actually post a link but just search for librivox. You will have to look through their list of available recordings to see if there is anything that would appeal to your child. I have listened to most of the Wizard of OZ series from their readers and they are quite good. All the reading is done by volunteers and they only do books that are out of copyright so they can keep the downloads free.
Hope that helps.
Disney Fan Shawn