The proceeds will go to the family of another Navy SEAL who perished in a training accident in March.
Mark Owen, the pseudonymous author of 'No Easy Day', which detailed the bin Laden mission by SEAL Team Six members, told ABC News he was approached by a friend who was setting up the auction and volunteered to donate the knife he's carried with him on missions for over eight years.
Shadle, who served in SEAL Team Six with Owen, was killed in late March in a training accident in Arizona.
Owen's knife, a folding Emerson knife that Owen said was his secondary blade, was bought by an anonymous bidder.
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It was one of several items in the charity put on by The Macalan Group along with Combat Flip Flops and Intelligent Waves IW simultaneously online and at the Special Operations Forces Industry Conference and Exhibition (SOFIC) hosted this in Tampa, Florida.
"People were cheering, folks were in tears," he said.