Glasses USA takes 50% off most items sitewide via coupon code "DEALNEWS50". Even better, that same coupon code yields free shipping. You'll also get $20 cash back, usable on the next purchase you make within 12 months. (You'll receive an email with the credit code within 14 days of delivery.) That's tied with a November mention as the best discount we've seen from Glasses USA. (We saw 50% off without the cashback in March.) Eligible items include single-vision lenses and frames from brands like Ralph Lauren, Jones NY, Lucky, and more. Frames marked "Premium" are excluded. Deal ends September 30.