REI takes up to 66% off a selection of electronics, watches, backpacks, and accessories. Choose in-store pickup when available to avoid the $5.99 shipping fee, or spend $50 or more to qualify for free shipping. (Many items have shipping restrictions that prevent in-store pickup.) 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.
Shnoop offers the Oakley Men's Tailend Round Sunglasses, model no. OO4088-05, for $75. Coupon code "SDTAILEND7" cuts it to $68. With free shipping, that's the lowest total price we could find by $30. They feature 100% UV protection.