For cold sore sufferers, most drug stores sell those little single use vials that you crack and apply to your cold sore. The price ranges from $10-15 bucks for 2-3 single applications. If you take a look at the active ingredients, the main ingredient is benzalkonium chloride….which is the same active ingredient in Bactine. You can buy a 6oz bottle of bactine for the $5, and thats probably the equivalent of 100 doses of the single use application.