Newspapers would routinely insert special magazines or coupons that you can exchange certain collectibles. Sometimes they cost a little money (a dollar or two). Me being a Yankee fan, I was a sucker for them. This is a nifty magazine insert that was included every Friday for almost three months. Then after that, the inserts were posters. I don't think that you can say that they were hastily put up materials. On the contrary, the magazines had well-written articles and was tantamount to a game broadcast with all the stats, facts, and figures. But I can't say the same about the posters; they were horrible.
And when you go to a game (whatever sport) there are giveaways at the gate. These too were collectible items. In New Jersey, I got a Devils scarf. At Nassau, I think I had shirts, stickers, and bobble heads. At the old Yankee Stadium, I got a scarf, a shirt, a bobble head, several free drinks, and others collectibles. Obviously, I don't have any of that with me now since I left everything back in my old room there save for a Yankees bandana from Snapple.