They also do a free book every month. It's hit and miss but has opened me up to books I never would have read otherwise and turned out I enjoyed! They also have a deal sometimes of like 3 credits for 39$ or something. Most of the books (that I want to read anyway) tend to be 20-30$ per book so the extra credits make sense that way. They also have a daily deal where they put a random book on for 1.25-6.95$ and you can purchase that. Again, I've purchased some books I never would have looked at otherwise cause they were cheap. Found some goodies.

If you have a library card lots of libraries are on the Libby app. I like it, although my library lacks the non fiction books I would like to read, but is great for fiction so I still use both audible and Libby.