eBay has the Oakley Half Jacket 2.0 Men's Polarized Sunglasses (OO9144-04) for $70 with free shipping. List price: $164. Features semi-rimless frames, black polycarbonate lenses, provide 100% UVA and UVB protection.
Amazon has the Sungait Polarized Driving Sunglasses (several colors, SUNGAIT9951085) for $16.99 - 5% off coupon (Clip extra savings coupon) - $6.50 off with coupon RMD3QC9N = $9.64 with free shipping on $35+ or with Prime. Features composite-UV400 lens, high quality metal frame, 100% UV protection. Has excellent Amazon Reviews.