I'd be interested in seeing any photos of baseball card advertising or other baseball card related stuff at the ballparks. Here are some photos I've taken this year and last year at some ballparks:
Angels 2013 photos:
Giants 2012 photo with an Obak card in an Anchor Steam Beer ad sign:
I just went to a Padres game a couple days ago and I couldn't find any baseball card stuff anywhere in the park.
No rush, take a camera the next time you go to the ballpark in your area and take any photos to add to this thread.