Just to point out if you add $50 on this service over the next month or so you get a bonus $10 added to your account as a digital credit:
https://www.amazon.com/gp/browse.html?node=16219202011&pf_rd...
>To use your credit, simply purchase an eligible product from one of the following digital categories: Appstore, Kindle books, Digital Video, Digital Music, Digital Software, and Digital Video Games
No physical goods.