Add three select skin care items to your shopping cart at Walgreens.com and your lowest-priced item will be free. For example, buy three bottles of CeraVe Resurfacing Retinol Face Serum, regularly $19.99 each, and your price for all three will be $39.98, or less than $14 each, which is the lowest price we could find. You can mix and match brands. The offer includes Neutrogena, Gold Bond, Mederma, and more. Shipping is free on orders over $35. Otherwise, it adds $5.99. Sales tax is charged in most states.