discount tires here in Mpls, MN told me that when they sell any tire, it comes with a lifetime repair warranty, so if you get a flat and the tire can be repaired (not replaced) they will repair it free of charge.
Not sure cause I just bought 4 tires from tirerack and there was no option for warranty. However on the shipping list from the postal service tracking it shows they are shipping a warranty packet so give me a few days and I can let you know.
Most places the road hazard warentee is purchased with the tires. Where I work (Costco) its free. We will plug tires for free, and if the tire need to be replaced and has under 3/32 of wear we will replace it for free, anything more and we will prorate the replacement tire.