Groupon offers the Persol Unisex Polarized Sunglasses in Black or Havana for $82.99 with free shipping. That's $5 under our mention from four days ago and the lowest price we could find today by $57. The Black pair feature 51mm lenses, while the Havana pair feature 54mm lenses. Deal end May 21.
Update: The price has increased to $87.99.