Jeter signs in person for free a lot more then people may think. I've seen him sign before games inside the stadium, and he even signs if he's out walking on the street. There's a lot of in person successes with Jeter on a sports autograph website I'm on as well. He will rarely sign on the sweet spot and will usually give a rushed signature, but it's still a Jeter autograph.
Now if you're a single gorgeous lady and are lucky enough to make it home with him for the night, he will send you off with some signed memorabilia - according to a NY Times article