Amazon has the Gioventù Unisex Polarized Sunglasses for $39.99 - $29.99 off with coupon 5WLC4VNF = $10 with free shipping. Features plastic frame, 100% UV 400 protection, NXT Trivex TM advanced polarized composite lenses.
Has excellent Amazon Reviews.
Nordstrom Rack is offering Up To 84% off A Selection of Men's And Women's Designer Sunglasses as part of their Designer Sunglasses Flash Sale. Shipping starts at $7.95, or get free shipping on $100+. Brands include Gucci, Prada, Givenchy, etc.