May 5-11: 3 Bonus stars with Breakfast Sandwich

Between May 5-11 in 2015, if you are a Starbucks Rewards member, you can earn 3 bonus stars (in addition to the one standard star) when you purchase any breakfast sandwich (eight different choices). You can use this promotion as many times as you like. No coupon code needed and no opt-in required. The usual terms and conditions apply for these type of promotions.

Assuming a 50c value per Reward star (assuming you redeem your Reward on a $6~ item). you are effectively getting $2 off per qualifying purchase.