(CNN) - If you want to have lunch with billionaire investor Warren Buffett, you need really deep pockets.

An anonymous bidder paid almost $3.5 million for lunch with Buffett as part of the investor's annual charity auction on e-Bay.

The winner and seven friends get to dine with Buffett at the Smith and Wollensky Steakhouse in New York.

The auction benefits the Glide Foundation, which helps the homeless in San Francisco.

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