Coastal (also known as Coastal Contacts) offers a select pair of glasses with lenses costing $100 or less for free via coupon code "VISIONFREE". (Be sure to apply the code during the last stage of checkout.) Alternatively, the same coupon can be used for $100 off lens upgrades. That's the best dollar-off discount we've seen from Coastal. (Our previous best was $99, during Black Friday week.) Plus, get free shipping on all orders, or upgrade to express shipping for $9.95. (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.

Note: If you have already received a free pair of glasses via a similar promotion from Coastal Contacts, you may not be eligible. (However, existing customers can instead receive 30% off via the "VISION30".)