Groupon offers the Ray-Ban Unisex Tech Carbon Fiber Sunglasses in several colors (Gray pictured) for $87.99. Coupon code "SALE3" cuts it to $79.19. With free shipping, that's $8 under last week's mention and the lowest price we've seen. (It's also the best today by $50.) They feature U.V. protection and 61mm polarized lenses. Deal ends May 20.