Getting my kid autographs

So my 10 year old is a huge fan but we have yet to get a single Astro to sign, just visiting teams. After going to see the Orioles in Baltimore where all the players signed (and happy to do it), he is all in to the O’s. It’s sad.

We are going to the home stand this weekend. Mancini has been his fave player for 2 years but now he’s an Astro – should we assume he won’t sign now? Should we give up? We cannot afford the owners experience for $250. Help!