Pay $5 and get a $10 Starbucks eGift Card at LivingSocial. After you pay, the "Buy" button turns into a "view my voucher" button which brings you to a page with an eGift card. It essentially works as a gift card that you print out and bring into the store.
The page might crash in the process. I had to go through a few Error 503's before it finally worked for me, but my credit card was only charged once.
Description from website:
Fall's on the horizon–the perfect time to catch a stunning sunset, a football, and this offer from Starbucks: a $10 Starbucks Card eGift for just $5. Students starting the semester can get ready for those marathon study sessions with friends, sipping delicious drinks and swapping stories. Parents dropping their kids off at school can grab some much-needed "me" time with seasonal favorites like the Pumpkin Spice Latte. After you buy this deal, you'll receive your $10 Starbucks Card eGift via e-mail.