I happen to know the family who owns four of them in my area so I go there in emergencies. They give me 30% off and no tax. If I ever need anything from them they'll have it the next day. The best part is every once in a while I'll get something new to try and return it almost empty, whether I like it or not. Get a refund back! Alot of times they flat out give me stuff to test because they know I'll be reliable for the truth.
Regardless, though, I still go somewhere else just because I think their GNC is an evil axis of power.