@Anthony SimboliYou can go to ASHI.org and search for a certified one, they passed a battery of tests to become certified and follow a code of ethicsPaul

Your individual experiences are one data point.

Many charge if you want a lot of data in machine readable format.Also try "county assessor". 

Testing has shown that hand written gets more response.

It hasn't gone on the market yet so the seller is thinking he can test the market at 400k for the summer or possibly sell it to a historical foundation which I think would take a year to deal with and probably won't fly.I want to present a seller financing option considering that the brother's don't have a mortgage on the property.

We are testing a few different ones.

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Most will be inconveniences and people who test your patience. 

The home failed the city's sewer dye test after my bid was accepted but before my home inspection.