I bought a basic three-ring binder, then typed up a cover sheet and divider sheets.
I added a few extra pages for stats/favorites. My guy loves keeping track of various statistics and sports trivia, so I think he'll love some extra space for his notes.
"I take pride if you can do either of two things -
make a child fall in love with baseball
or make an adult remember where and
when and why and how
they fell in love with baseball."