I paid for 116 audio books so far. Where can I store them? I do not want to delete.

With Audible, Kindle, Nook, Apple and others your purchased books live permanently in your online account with those providers. So you can delete books from the providers app and you won’t lose them. They can be re-downloaded from your account online with the provider.

I honestly don’t even know how many ebooks and audiobooks I have now from Amazon, Apple, Barnes and Noble and others. I have not bought a physical book in at least 10-12 or more years. Only some of those are in my apps on my devices for those providers though.

You can remove them from the iPad. They are stored in amazon's cloud and can re be-downloaded at no charge.

I have 586.

Go to audibles site, log in.

check your library.

Your books should be there.