If purchases tires from Discount Tires. I had a blow out. Will I have to purchase a new tire, or given a discount to replace,?

when buying tires I always get the rose hazard warranty this way I don't have to worry about what is going to cost to replace the tire

Do you fix flats?

If you purchase the road hazard warranty they should replace it for free as long as the tires were not worn out of spec already

If you bought the road hazard warranty, they will replace it for free. If you didn't, they will pro rate the price.