Convicted Ponzi schemer Bernie Madoff has apparently put his financial knowledge to work for him as he serves a 150-year-prison sentence in North Carolina.

According to MarketWatch, the disgraced former New York City financier purchased the prison commissary's entire stock of hot chocolate mix and has been selling it for a profit.

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Madoff, 78, who is serving time at Butner Federal Correctional Institution outside Raleigh, has been facilitating sales of the beverage mix on the prison yard, Clayton Morris reported.

Journalist Steve Fishman told MarketWatch that Madoff "made it so that, if you wanted any [hot cocoa], you had to go through Bernie."

Madoff was convicted in 2009 of bilking investors out of a combined $65 billion.

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