Amazon cuts 30% off select men's, women's, and kids' sunglasses via coupon code "30SHADES". Plus, Prime members receive free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping starts around $5.) Deal ends March 28. A couple of best bets, with prices after coupon:
6pm offers the Oakley Men's Garage Rock Sunglasses in Crystal Black/Red Iridium for $49.99 with free shipping. That's the lowest total price we could find by $10, although we saw them in a different color for $11 less last month. They feature a stress-resistant O Matter frame and Plutonite lenses with UVA, UVB, and UVC protection.