Audible is one of the most popular audiobook and podcast platforms on the planet, giving you access to many thousands of pieces of content directly through your smartphone. The service typically costs $14.95/month, but right now new subscribers to the Premium Plus tier can check it out for three months without dropping a dime. This effectively allows you to pick up three premium audiobooks for free--and they'll be yours to keep, even after you cancel the service.

Each month, Audible Premium Plus members are given a credit that can be redeemed for a free audiobook or other piece of content that isn't normally included in the Audible library. This means you'll generate three credits throughout the three-month trial, letting you add three audiobooks to your library for free. To sign up for the deal, head over to the official Amazon's Audible hub.