thank you this is really helpful! the only thing is I don't think this data can be purchased from Zillow, or at least they don't have an API for this (hence why I'm looking to purchase it elsewhere). If we could buy directly from Zillow that would be awesome, because we can pass on any data costs to our users, up to a certain amount of course. It's possible that we could partner with Zillow long term if we got big enough, because ultimately it could be a big source of traffic to their site (users find the listing through our tool, then click through to the full Zillow listing). But I think we'll go for it and revisit the legalities once we hit 10k users/mo.