Select 5 Audible books for $15 for prior members
Get any regular price book from Audible and 4 additional books from the 200+ books on sale for $5/each for only $15.
This deal will work for people like me who have already taken advantage of the free and or cheap membership deals and can't get another free or cheap membership.
1) sign up for the $15/monthly plan. You will immediately get 1 credit you can use to download any book. I chose The Martian.
2) next go to your account page and select to cancel your membership. I was offered a $20 account credit to not cancel.
3) accept the $20 credit and it will appear right away.
4) purchase 4 books from the $5/book sale using this credit.
5) cancel your service again. This time for real.
This worked for me. Not sure if the $20 account credit will be offered to everyone. Give it a try.