Worth-Buy via eBay offers these Unisex American Flag Aviator Sunglasses in Black, Silver, or Gold for $5.95 with free shipping. That's tied with our mention from three weeks ago and the lowest total price we could find by a buck. They feature metal frames and 100% UV400 protection.
Cycleling via eBay offers the Rockbros Unisex Polarized Cycling Sunglasses in four colors (Black/Blue pictured) for $13.99 with free shipping. That's the lowest total price we could find by $1. They include a carrying case.