Amazon has the Sungait Men's Polarized Driving Sunglasses (Gunmetal Frame/Gray Lens) for $19 - $9 off with coupon UCJ23RQ3 (Ends 2/24) = $10 with free shippingon $25+ or with Prime. List price: $49. Features metal frame, composite lens, polarized, and 100% UV protection.
Has excellent Amazon Reviews.
eBay has the Ray-Ban Unisex Aviator Classic Sunglasses (Bronze/Green) for $63 with free shipping. Features 100% UV protection, 58 mm lenses, 14 mm bridge, temple length 135 mm.
Patagonia is offering Up To 50% Off Select Men's, Women's, And Kids' Apparel And Accessories as part of their Winter Sale. Prices are as marked. Shipping starts at $8.50, or get free shipping on orders of $75+.