Starbucks has this fun promotion available again.
If you send a $5 gift card to someone, you will get a free $5 gift card for yourself back. This is a great time to say thanks to a friend, send one to your child’s teacher with a note to enjoy the break, send one to your spouse or even a child.
You need to do this via the app and they walk you through the step by step directions here.
The offer is available to the first 45,000 people only and it does not say when the offer expires. I would get going though if you are interested.