I found a $3 off $3 or more coupon.
May I add something to Froid's great post?
I found my coupon from the app, also. Here's how. On the app, I selected "books." That took me to a page that had all kinds of books, including audiobooks. Click on the Ebooks option in the menu near the top of the page. You may need to select "books under $10;" I've forgotten. Anyway, scroll down a couple of screens. The offer to me is located in the middle, going from left to right, or right to left, depending upon how you look at it.
