Last year we built this for my Daughter:
For the last couple of gift giving events, birthday and Christmas, we and other family members have been giving my Doughter "stuff" to fill the house. The house needed furniture and other items for the kitchen. Today we went to a store that specializes in doll houses. As I was looking through the many displays of all the accessories all I could think of was "holy cow". The prices of that stuff was out of this world. There was this bookcase that sold for $400. Now if you aren't familiar with doll houses, they are set up on a 1/12th scale. So this 1/12th size bookcase was $400. I can see it would be easy to drop a couple of grand in stuff for your doll house. I don't feel so guilty for buying $300 planes anymore. Oh, and don't think you can just buy the house kit, take it home and slap it together, it's almost like building a real house.
I wrote a little article on the building phase of my Daughter's house which you can read here.