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18" tires aren't cheap. Nobody makes repro 18" GTO wheels yet either, so factory wheels are in higher demand than the chrome SS wheels in your sig and prices you might be used to.
I don't sell rare or special edition factory wheels. Stuff like the 35th SS wheels, Firehawk wheels, etc... This car isn't a special edition. Whoever buys it later on will probably not care about the factory wheels being available.