Aug 22, 2007 1:29 AM EST

No. 756 is going to auction.

Barry Bonds' record-breaking home run ball will be sold online, and fortunate fan Matt Murphy figures to be a half-million dollars richer.

The 21-year-old New York man said Tuesday he had no choice but to sell the ball -- several people told him he would be taxed on the valuable souvenir if he holds onto it.

Via AP