Next to swapping via the post, there is also a possability to do so in 'real' life. A couple of years ago I had such a beautiful day. You take whatever you have created, or don't want, with you and are willing to trade.
You see so many beautiful stuff you don't even know where to look. Alone becouse of this day I cannot trow anything away as you never know when you can trade with enthousiastic fellow doll house lovers.