Today only, GNC cuts 25% off sitewide via coupon code "OCTSAVE25". Plus, all orders qualify for free shipping. That's tied with our mention from two weeks ago as the best discount we've seen from GNC this year. Sales tax is added where applicable and some exclusions apply.
A best bet is the GNC Ultra Mega Green Men's 60-Count Caplets (pictured) for $21.99 before the above coupon, $16.49 after. (Search for "139422" to see it.) With free shipping, that's the lowest total price we could find today by $11.