If you buy one from GNC you get their Gold Card gratis, and it should apply to that purchase, so it's 79.99.
Click ok for their messages, and watch for occasional "one-day 25% off GNC-wide" sales on their website and jump on it - - that brings the cost down to 60 per bottle (plus your State's sales tax) - - order several, and wait for the next one.
Also smart to backlog several because when this rocket goes off it may be short supply time for a long while.