There is a finished Contemporary Ranch Dollhouse on ebay with a starting bid of $237.49 (+$200 shipping). I hadn't seen a close up of the stairs so I wanted share some photos from the listing. Here is the listing on ebay.
The Contemporary Ranch Dollhouse unfinished kit usually sells for $160-$200, but there is also one on ebay with a starting bid of $65 (ends in 3 days). That ebay listing is here.