If you’re not a Starbucks Rewards member, you can head over HERE and sign up through 9/22 and get a free beverage just for doing so.
What is My Starbucks Rewards?
Earn points redeemable for free drinks when you register and use a Starbucks gift card for your purchases. Continue to reload the card as needed and get freebies all year long. You’ll also receive occasional emails and postcards good for free food and drinks.