Somewhere in the range of $300-$400 depending of course whether the Basketball is an authentic Spalding NBS ball, considering he is sure to be a hall-of-famer one day.
Since his retirement his autograph has been hard to come by.
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The value of a basketball autographed by Michael Jordan would go from the cost of $500 to $2,000 depending on when it was autographed.
Most of them seem to go somewhere between $300-$400, but that's assuming you have some sort of authenification.