Get a free audiobook from audible.co.uk by signing up from the link. You get a 14 day free trial and get 1 credit to spend on any audiobook. Be aware that at the end of the trial they will start charging £7.99 a month so make sure you cancel your membership before the 14 days are up.
I got the da vinci code - dan brown (unabridged) which normally costs £35 on this site but i got it for free.
The audiobook can be put on more than one formats including ipods mobiles etc.
If you have a mac it can be easily put on ipod using itunes and if you have windows then there is a program you need to download. It explains it quite well on the site on how to put it on different formats