I think trying to complete all the variations are even tougher and more complicated than trying to find thunts. , thats why I just stick to the hunts....
but in my opinion, I guess you would need to really work hard hunting for them and also have a network of people helping you out like some of the people here. People from overseas like Canada, US etcetc also would help greatly especially with the kmart exclusives if you also count that in as varaitions, then you would really need overseas help. You can give up if you think you cnnot complete it but then agin you gotta be patient. Nothing is impossible with the right timing and sometimes sad to say, price....