Glasses USA takes 50% off most items sitewide via coupon code "SPECIAL50". Even better, that same coupon code yields free shipping. That's almost as good as our August mention (which included $20 cash back) and is still the best percent-off discount we've seen from Glasses USA. Eligible items include single-vision lenses and frames from brands like Ralph Lauren, Jones NY, Lucky, and more. Some exclusions apply.