Earn a star from entering the code from specially marked Starbucks coffee bags. And if you enter two codes from June 16 - July 14, 2013, $5 will be loaded to your SB card/account. Limit two $5 rewards per account. Allow 4 - 6 weeks for the value to be loaded to your account.

See http://www.starbucks.com/rewards to enter the code and for more details.

(btw: the details of this offer don't appear until you enter a code.)