Affiliate programs

Audible

Audible is Amazon's audiobook and spoken-word audio service, offering listeners on-demand access to a vast catalogue of audiobooks, podcasts and original audio productions.

Range: bestsellers and classics in fiction, non-fiction and self-development, plus exclusive Audible Originals.
For whom: commuters, book lovers and anyone who prefers listening to reading.
How it sells: a subscription membership with monthly credits for titles of the member's choice, cancellable at any time.
What sets it apart: a huge library and a sign-in tied to the customer's Amazon account.