Get up to 60% off select full-price prescription frames when you enter code SUMMER60 at checkout at GlassesUSA. Plus shipping and returns are free on all orders. These frames include single-vision or reading lenses. This drops select frames to as low as $19.20 with the code, but we found most average closer to $23.20. There are hundreds of styles for men and women, although this code does not work on already-discounted styles or name brands. There is no sales tax on prescription eyewear (except AL, HI, IL, KY, MO, NE, NM, NV, OH, OK, SC, TN, and UT).