Duduma via Amazon offers its Duduma Unisex Polarized Rimless Fashion Sport Sunglasses in Black/Blue (pictured) for $19.99. Coupon code "57OE7BZR" cuts them to $9.90. Plus, Prime members receive free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.48.) That's $2 under our August mention, $30 off list, and the lowest total price we've seen. They feature 100% UVA and UVB protection, shatterproof lenses, a super-light TR62 frame, cleaning cloth, and fabric pouch. Deal ends October 15.

Update: The price has dropped to $14.99 before coupon, $4.90 after.