At Zenni Optical, buy one pair of eyeglasses for $12.95 or more and get 50% off a second pair. That's best deal we've seen on glasses from Zenni Optical in recent months and it yields many price lows, although we saw a buy-one-get-one-free offer in September. Shipping adds $4.95. Additional upgrades are available at extra cost, including tinted lenses, anti-reflection coating, and more. Deal ends November 26.