Boost at Walgreens for only $3.34 each!

Boost is on sale at Walgreens this week Buy 1 Get 1 50% off. Plus receive a $5.00 Register Rewards if you spend $20. There are $2/1 coupons available at coupons.com or here.
Start by buying 4 Boost at $8.79 each - Total: $26.36 (B1G150%). Use 4- $2/2 coupons.
Pay $18.36 out of pocket.
Receive a $5 RR (good on your next purchase)
Total spent: $13.36 - just $3.34 each!