i start to buy wall on the ds for my first big buiding (school ) , it was very expensive , sure there's not many wall on playmobil buiding and we have to do that to enlarge buiding (but no little things very usefull and expensive to go with ). Now i know i use the other parts somewhere else so i prefer to buy the megaset (not news if i can) , it's cheap for me even it's not always like new . jeremy