Amazon offers the 3M Headlight Lens Restoration System, model no. 39008, for $4.51 with free shipping via the directions below. That's the lowest total price we could find by $11 and within a buck of the lowest total price we've seen.This automotive headlight kit purports to remove scratches and restore cloudy, dull lenses. Rebate ends December 31.

To get this deal:
01. View the 3M Headlight Lens Restoration System for $17.07
02. click "Clip Coupon" (just below the product price) for $5 off
03. add it to your cart via Subscribe & Save and it drops to $9.51 with free shipping.
04. redeem this $5 mail-in rebate for a net price of $4.51

Be sure to cancel Subscribe & Save after your order arrives (it's easy to cancel) or you'll be billed for subsequent shipments.