Outside some ballparks there might be a vendor who is selling an unofficial program for about less.
Programs are great sources of information about the teams and players that are playing that day.
They also contain a scorecard. If you don't want to use the scorecard from the ballpark, you can buy a book of them at a sporting goods store. You can also create one, making it as simple or complex as you like. It's not difficult. If you prefer, you may download and use one of the simple scorecards that I created.