Thanks for the suggestion. I'll try them.
In the meantime I had found an online program that converted MP3 files to wav, but I had to upload, wait, then download onto my desktop before being able to put them back as a playlist that I could burn to disc in iTunes. It was quite a lengthy process for each track! I made a 30-minute CD to see if my son liked the book or not... if he does I hope your suggestions are more user-friendly!
Thanks again!