6pm takes up to 75% off a selection of Spy Optic Sunglasses, with prices starting at $25. (Prices are as marked.) Shipping adds $4.95, but orders of $50 or more qualify for free shipping. (Orders with two or more items also qualify for free shipping.) A couple of best bets:
6pm offers the Oakley Men's GasCan Sunglasses in Crystal Black for $69.99 with free shipping. That's the lowest total price we could find by $20. They feature O-Matter frames and 100% UVA, UVB, and UVC protection.