Sometimes the market presents unique opportunities to get an even bigger discount on a stock that's already trading at an attractive price. Warren Buffett's Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) appears to be latching onto one of those opportunities right now.

Berkshire Hathaway bought a combined $167.5 million worth of Liberty SiriusXM (NASDAQ: LSXMA) (NASDAQ: LSXMK) tracking stock in April, bringing its total position to about $2.6 billion. The tracking stock closely follows Liberty Media's position in Sirius XM (NASDAQ: SIRI), of which the media company owns 83%. Berkshire's also an investor in Sirius XM, although its total investment currently stands at just $125 million as of its most recent update.

But there's a good reason for Buffett to favor the Liberty tracking stock over shares of Sirius XM. It's getting a nice discount.

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Source Fool.com