After extensive research I feel it's unfeasible to have items manufactured out of plastic since injection moulding procedures require a minimum of 5000 units. Considering that each vending unit can hold 50 balls which must form a collectable set, I will end up with less than 10 replicas of a single toy or item. The easiest way would be to make them by hand, or commission someone to do so. I'm looking into alternative materials that mimic the appearance of PVC plastic...two good options seem to be polymer clay (Fimo) and cold pottery. Examples of models made with these substances are shown below. There's also the possibility of graphical (maps, booklets, stickers), soft ('plushys', crochet, felt) toys, or altered versions of existing items.