If you live driving distance from San Francisco, CA or Grand Rapids, MI there are are two Kaleidoscopes Houses up on Craigslist.
San Francisco posting: $225. "Has been used, has some scratches and the white has yellowed a bit, but perfect for actual kid use (rather than the collector). Furniture not included." I would have bought this one in this condition, if I didn't already have one. Just a note, white plastic yellows with age so every Kaleidoscope house will have that discoloration. Gives it that antiquey look.
Grand Rapids posting: $300. "Was his daughter's, but she didn't play with it very much. Excellent condition. Has some furniture." I would jump on this if I lived close.
There is one on eBay in Gillett, NJ going for $425 + $199 shipping to continental US only. But it looks well used based on the condition of the furniture and cracks in the acrylic. In this condition and price plus shipping, I would pass on this one. If you are local, you could offer less if it doesn't sell. The small cracks are in the wall structure of the house which would be hard to replace, but the two large cracks in the removable yellow panel could be replaced with a new piece of acrylic from a plastics store. Depends on how bad you want one a K House.
(images from SF Bay Area craigslist post)