For this one you must be an Amazon Prime member.

Get a $3 Amazon Credit when you borrow your first Prime Reading Book. It’s a free service they are offering now, you can borrow your first book for free.

Click here to borrow your first book. Then you will receive an email with your $3 Amazon digital credit. The credit can be used on music, eBooks, or movies.

Promotional credit expires at 11:59 p.m. (PT) April 30, 2019.

If you aren’t an Amazon Prime member you can get your free trial here.