Posted By:
MattAnthony - just browse to that category:
http://collectibles.listings.ebay.com/Ephemera_1900-20_W0QQfclZ3QQfromZR11QQsacatZ41188QQsocmdZListing ItemList
and do a search for baseball including the item description. There are just a few items to look through, but almost always interesting.