So you won't believe this luck...after checking out lots of links, I showed DS some of them and asked him to give input on which ones he liked best. He tells me that he wants one just like the one he saw at our cousin's house a few weeks ago. I was more confused than ever.
So I email my cousin today for the brand of house they have and ask where they got it. He called me back and said "Do you believe in the idea of the universe bringing things your way as a result of your thought and intent?" Â I wasall "Um...I guess. Why?" And he tells me that just last night he was pulling out his kids' dollhouse to display some nutcrackers on and he said to his husband "You know, the kids never play with this and never really liked it. We should find it a new home." Â Then he gets my email this morning. :)
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I immediately offered to buy it from him and he said absolutely not, but he'd be more than happy to GIVE it to us. I double and triple checked with him that his kids (8 and 11) were absolutely willing to get rid of it and he said that yes, he asked each of them and they said they never really liked it and won't want to play with it in the future.
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It's a Ryan's Room dollhouse with tons of furniture and dolls. DS is going to be over. the. moon. on Christmas morning! Not sure where we are gonna put it, since it is larger than I was anticipating, but I'm sure we'll figure something out. Totally a good problem to have. 
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Thank you all again for the wonderful suggestions. We just might be able to get that wooden mushroom house now after all. :)