No more stamps needed, just flash your card. The 6th drink shall be free.
Just go to any Boost Juice retail outlet and ask for a Boost Vibe Club Card, and then activate it at http://www.boostjuicebars.com.
When the activation is complete, you get 5 points loaded automatically. Each time you buy a drink and show your card, you get 1 point. Hence, the 6th drink will be free.
Plus, you get a free drink on your birthday.
Not a fantastic offer. I thought they used to offer a free drink after 5 drinks, or maybe it was other smoothie companies.