Earn a free prescription on your single-vision sunglasses order with code SUNNIES2013 at Glasses USA. This is a $35 savings, whether you choose the $44 frames or those higher in price. In addition to being the best prices we could find, your order will ship free (saving you an additional $8.95). Note that inventory is low on some styles. Add single-vision or progressive lenses, and any other lens options to any sunglasses category frame and apply this coupon at checkout. Most additions incur additional charges. Sales tax is charged in most states.