But what type of range are we talking? Tens, hundreds, thousands?
Seems like the first thing to do would be to get an account with one of these data brokers. I'd imagine most of these places are "contact us for pricing" so they can play used car salesman games
Or, you could ask John Oliver to do it for you and then tell all of us on one of his episodes exactly how in depth it could get. They have the money to do this, and it seems like something right in his team's wheel house
Just because someone doesn't answer your belligerent questions does not mean it's not possible. It probably means that the people that are doing this with first hand knowledge have too much to do than trying to convert doubting Thomas over here.