Donut for LS500H

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Hello,
My Lexus 2018 LS500H came with run flat tires and no spare. At some point I want to replace these tires with regular tires and I want a donut. Through the Lexus dealer, these are expensive but I don't know where else on the internet to find. Is there a specific donut for this car, or a general donut that will work just to get to a tire shop? Any suggestions?