How much is a George Brett baseball bat worth?

Question
I have a Louisville Slugger bat that says genuine T85 George Brett that my dad bought around 10 years ago. It is signed by him and has a crack in it that he was told was from a game when he played for the royals. Does anyone know what the value of this bat is?...A guess?
Answer
At least over $500 dollars. Members of my family have told me stories about his hitting prowes. The crack in the bat might bring the value down by $100 dollars or so. I personally would keep the bat, you can't put a price on something your Dad bought for you.