I check internet for best prices on correct type Michelin tires and then call my local Discount Tires and Allen Tire Store to see if they will match the prices including mounting, balancing, taxes and disposal fees. Expect to pay around $300 apiece. They may have to get tires from a warehouse, make sure that tires are recent manufacture by DOT date codes. Not necessary to replace spare tire if less than 10 years old and unused. Old spare is ok to use for trip to the tire store at reduced speed, don't rely on it.