Unfortunately, your gonna have to dig out your wallet. If there is a Discount Tire near you, check with them because they have the best prices. The Lexus SC430 is definately high maitenence because it is one of the flagship models and it's Toyota varient is not availible in the United States. All I have to say about getting non-runflat tires is, good luck if you get a flat. Good Luck to you anyway and don't spend more than $1500 for them.