Coastal (also known as Coastal Contacts) takes 50% offglasses and sunglasses via coupon code "SUMMER" as part of its Summer Clearance. That's the best sitewide percent-off discount we've seen from Coastal this year. Shipping starts around $10. (Note that a mandatory shipping insurance fee, that varies based on the value of the frames, will also be added.) Several terms and conditions apply. Deal ends July 31.