Amazon offers the 3M Headlight Lens Renewal Kit with Protectant, model no. 39045, for $4.44 with free shipping via the directions below. That's $9 under last week's mention, the lowest total price we could find by $26, and the best deal we've seen. It purports to restore the clarity of hazed or dull headlight lenses. Rebate ends December 31. To get this deal:
  1. View the 3M Headlight Lens Renewal Kit with Protectant for $16.99
  2. clip the $5 off coupon on the product page to cut it to $11.99
  3. add it to your cart via Subscribe & Save for $9.44
  4. this $5 mail-in rebate cuts it to a final $4.44
Be sure to cancel Subscribe & Save after your order arrives (it's easy to cancel) or you'll be billed for subsequent shipments.