Amazon offers the Ray-Ban Men's Wayfarer Sunglasses in Tortoise, model no. RB2132, for $66 with free shipping. That's $4 under last month's mention of a different color and the lowest total price we could find by $10, outside the offer below. They're available only in size 52mm .

Of note, Jet offers it to new customers for $61.54 with free shipping via coupon code "15BUCKSNOW". (Prices vary slightly by ZIP code.)