Okay not a "sunnie" sale per se, but Shopbop IS having their buy more save more event (use code GOBIG) which I think is a good time to invest in some staples since they don't ever usually go on sale like, EVER. Here are a few of my absolute work horses. Also this sunglasses box was a very good find on Amazon, under $17 (here).
15% Off Orders of $200+ with code GOBIG17
20% Off Orders of $500+ with code GOBIG17
25% Off Orders of $800+ with code GOBIG17