Hurry! For a limited time on Groupon select users can purchase a $10 Starbucks Card eGift for only $5.00! This is an invite-only offer but definitely worth checking to see if you got an invite. You’re looking for an email from the address email@example.com. You can use it at any participating Starbucks. Lucky users can redeem their gift cards during the Starbucks Happy Hour too, when all Frappuccino blended beverages are half off!