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At GNC, buy one select GNC-brand vitamin, mineral, herb, or supplement and get a second item of equal or lesser value for free. (Add two to your cart to get the discount.) Prices start as low as $3.99. With free shipping on all orders, it's the best such discount we've seen from GNC since May. Sales tax is added where applicable.
A best bet is to buy two bottles of GNC Vitamin C 1000 Tablet 500-Count (pictured) for $26.99 with free shipping. That's $0.03/tablet and the lowest total price we could find.