Today only, GNC offers a selection of men's and women's vitamins and supplements for $14.92 as part of its Columbus Day Sale. (Discount is shown in-cart.) Shipping starts at $3.62, or get free shipping on orders of $100 or more. That's among the best sales we've seen from GNC in recent weeks. (We saw 25% off with free shipping two weeks ago.) Sales tax is added where applicable.