A good start would be to identify what years they were issued. I'm pretty sure baseball cups were issued in 1972, 1973 and 1978. I guess a good place to start would be to look for the checklist sheets they gave out at the stores. They hit eBay a lot.
I found this list, not sure how comprehensive it is:
http://www.columbiacitycollectibles....20items_1.html