How much do you think these autographs are worth?

My girlfriend's uncle is a sports reporter in Scottsdale, so she went with him to the Cardinals-Steelers Super Bowl and they had media access to the players and got some stuff signed. She gave one of them to me yesterday, its a baseball cap with the Super Bowl 43 logo, and it has Kurt Warner, Ben Roethlisberger, John Elway (he was there for the coin toss), and Santonio Holmes' autographs all on the bill of the hat. I'm not going to sell the cap, it's the best Valentines gift I ever got, but was just curious as to what the value is.