A view of the Carro signage at their showroom in Singapore June 15, 2021. REUTERS/Edgar Su/File Photo Purchase Licensing Rights, opens new tabSINGAPORE, Aug 6 (Reuters) - Singapore-based Carro, Southeast Asia's largest used-car online marketplace, is preparing for a U.S. initial public offering as early as 2026 that could raise up to $500 million, according to sources familiar with the matter.The company is aiming for a valuation of more than $3 billion, according to the sources, who could not...