Hi Tiger,
Good topic. I have been collecting Jai-Alai memorbilia for about 15 years now and organizing a small home museum in the office room.
I think my most prized possessions would have to be opening night programs of: Acapulco (1951) and Jakarta, Indonesia (1971), Chicago Jai-Alai promotional magazine, 2 New Orleans roster photos and other autographed rosters of Miami and Tampa (1950's).