For two seasons now, my favorite sunglasses have been a pair of Mosley Tribes I picked up at Neiman Marcus.  They're a little pricey (though less expensive than their Oliver Peoples brethren), but subtly distinctive, with their modern take on classic shapes.  They're on sale today through Friday at Gilt.com, a private sale shopping community.  You need an invitation to join — click here for yours.  I picked up a silver pair of my favorite "Enforcer" aviators, for $98 — less than half what I paid for my first pair at NM.  You can also find selected styles on sale at bluefly.com.