You get the credit for buying select Kindle books. Here is a free download (double check before purchasing that that is still the case!) that qualifies. After purchasing, you should get an email with the code in it.

Amazon.com: Open Your Hymnal - A Devotional Book That Harmonize Scripture With Song: How Our Favorite Hymns Reveal God's Amazing Grace Through Hymn Story Devotions (Seeking the Heart of God) eBook: Denise K. Loock: Kindle Store