Jomashop takes up to 53% off select Oakley sunglasses, with prices starting from $59.99. Plus, take an extra $10 off via coupon code "DNEWSOAK10", dropping starting prices to $49.99. Even better, the same code yields free shipping. A couple of best bets, with prices after discount:
Certified Watch Store via eBay offers the Oakley Unisex Holbrook Polarized Sunglasses in Matte Black for $69.99 with free shipping. That's the lowest price we could find by $2, although most vendors charge closer to $80.