The auto business sure isn't burning rubber on Wall Street. But CarMax (KMX), the largest U.S. retailer of used cars, has caught the eye of Warren Buffett, who in February upped his stake to 9.6% from 6.4%, for a total of 21 million shares, worth about $396 million. What's so hot about CarMax? It's famous for its low-price, no-haggle sales style.
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