An e-retailer of discount-priced eyewear, GlassesUSA has a wide selection of prescription eyeglasses and sunglasses by brands that include Guess, Calvin Klein, and Coach. Shoppers can use GlassesUSA coupons to save on online purchases and also score free shipping. Other GlassesUSA deals include clearance-priced merchandise, free return shipping, a best price guarantee, and weekly deals that can save shoppers up to 50% or more.