How much would an Ozzie Smith autograph be worth?

I'm not looking to get rid of it just yet, but when Ozzie Smith was inducted into the Hall of Fame in 2002, they made a vast variety of products. He visited my school in 2007, right after my father passed away, and my principal had me meet him. He gave me 2 National Baseball Hall of Fame 2002 yearbooks that were signed by him (He signed them in front of me!), as well as a National Hall of Fame autographed baseball, and a autographed baseball cap. How much would these all be worth? They're defidently all authentic too, I met him!