Discount Tire will repair your tire free of charge as long as it is safe to do so. Used tires range anywhere from $20 to $50 if available.
Discount Tire repairs flats for free, but I don't know if they sell used tires.
What Brandon said, free fix and used is based on availability, although they have good prices on new. I have bought several sets from the I-240 store and the Moore store.
That would be best answered by a clerk there. They got good deals on tires tho. I got a set of four for around $400. That includes warranty for them
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