Amazon has the Bea Cool Polarized Sunglasses (several colors) for $23 - $14 off with coupon 60JDRJLB = $9 with free shipping on $25+ or with Prime. Features anti-reflective lens, 100% UVA & UVB protection, lenses made of shatterproof TAC material.
Has excellent Amazon Reviews.
Nike is offering Up To 40% off A Variety of Men's, Women's, and Kids' Sale Clothing Items and Shoes as part of Nike Sale. Shipping is free for Nike+ members (free to join).
Nordstrom Rack is offering Up To 86% 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.