Onedot1 via eBay offers this Automotive Laser Anti-Collision Warning Light for $2.48 with free shipping. That's slightly below our August mention and the lowest total price we could find for such a light by $6 (outside of other eBay sellers). It emits an adjustable laser that marks the ground at a safe stopping distance.

Note that this item ships from mainland China and may take three to eight weeks to arrive.