I bought the road hazard warranty "Certificate for Repair, Refund or Replacement", at America's Tire (Discount Tires) for about $84. I assume the price varies. I've replaced 2 tires already. (In the last month from off road adventures) Both tires were beyond repair. Both tires replaced. However, when they replace the tire you have to buy the warranty for the new tire. WAY cheaper than buying a new tire. For me, so far, out of pocket for "my" warranty & 2 New tires $130.
This is from there website.
"How Does It Work?
If a tire covered by the Certificate for Refund, Repair or Replacement fails due to a defect or an unrepairable road hazard, and still has legal tread (3/32") remaining across the tire, and it has been in use less than 3 years from date of purchase, Discount Tire will give a refund of the full purchase price, together with the applicable sales tax and give you the option to purchase the same new or comparable tire at the refund price, with the payment of any applicable sales tax. There is no prorating, no disqualification for any reason such as run-on damage and no mileage adjustment. It is the very best tire certificate program we know of"
It worked for me.
When I buy my new tires, I'm going up to 3 ply side walls. I don't like puncturing my tires on the trail. But I'm sure some of you have punctured 3 ply as well.