Amazon offers a $15 Amazon Credit for free when you add $60 or more in funds to your Amazon Cash account. It's limited to one credit per customer and account. Deal ends June 30 and the promotional credit must be used by July 31.

Amazon Cash is a service that lets you use cash to shop on Amazon. When you open an account, you'll receive a barcode (via text, the Amazon App, or to print at home) that you can bring to participating stores to add funds to your Amazon Balance. (Your Amazon Balance also includes gift card redemptions.)

Note: You can alternatively get $7.11 Amazon Credit for free when you add $30 in funds at any 7-Eleven.

Update: As a reader noted, this offer is limited to first-time Amazon Cash users. The expiration has also been corrected.