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Right now GNC is having a BOGO 50% promotion. It is able to stack with coupon code SHOPRUNNER on orders of $ 100 or more.
Apparently it only works on strawberry flavor at this point.
use promotion code: SHOPRUNNER20
20% off Orders of $ 100 or More
$ 80.38+tax w/ shopprunner
or
$ 80.38+tax + $ 4.99 shipping