Ending today at 11 pm ET, RobsCameraUSA via eBay offers the Ray-Ban Unisex Wayfarer Classic Sunglasses in Black/Green, Black/Green Matte, or Tortoise/Green, model no. RB2132, for $79.99. Apply coupon code "CJANUARY15OFF" and checkout via PayPal to drop it to $64.99. With free shipping, that's $5 under last month's mention and the lowest total price we've seen. (It's the best deal now by $12.) They feature a plastic frame and 100% UV protective coating and come in standard or large sizes, although not in all color/size combinations.
Note that this coupon can only be used once per account.