Sorry to hear you had a screw in your tire. Unfortunately, it happens from time to time. As you mention if your tire happened to be unrepairable and you have Certificates for replacement Discount tire would replace the tire free as long as there is still the appropriate amount of life left.Unfortunately I do not live close to a Discount Tire. It was only $21 for the repair. At least I know if I have a blow out they will replace or reimburse me for tire replacement
Just a heads up. Using a plug, VOIDS your Road Hazard warranty thru Discount TireThere's always a repair kit you could keep in the trunk for an emergency. As long as the nail isn't near the sidewall you could get a kit for around $20 bucks.