6pm offers the Oakley Unisex Frogskins Polarized Wayfarer Sunglasses in Grey Urban Jungle or Sepia Urban Jungle for $49.99. Plus, pad your order over $50 and bag free shipping. Excluding padding, that's tied with our June mention as the lowest total price we've seen. (It's also the lowest total price we could find now by $2.) They feature iridium lenses, plastic frames, and offer 100% UV protection.
Also available are the Calvin Klein Women's Platinum CK4152S Sunglasses in Havana for $39.99 before the above coupon, $24.99 after. With free shipping, that's $60 off list and the lowest total price we could find. Both deals end February 28.