Luxomo offers the Guess Unisex 6672 Aviator Sunglasses in Blue, model no. GU 6672 BL 9F, for $29.99. Coupon code "AFFGUESS23" drops it to $23. With free shipping, that's the lowest total price we could find in any color by $17. They feature plastic frames and mirror-tinted lenses. Deal ends May 25.