However, depending on the county and how sophisticated they are, the data may be very stale. 

My options are to either go myself, pay someone to do it, or use a probate lead data provider of some sort.

The program uses government data not Zillow, Turlia or Realtor.com.

@Joe Villeneuve, yes, one can do ones own comp valuations, even utilizing Zillow's SOLD data, but that does not assure the OP that his LENDER will use the same method for their appraisal of his specific property.

When I first started out, I had no historical data to draw from.

So, I'm wondering why the discrepancy between your boots on the ground experience and the latest data on home sales and homebuyer interest. 

Pulls data and sees what type of properties investors buy in what zipcodes of their market.

Market data for active, pending and sold comparable properties in your neighborhood to aid in pricing decisions.

There he sharpened his business fundamentals, data analysis skills, interpersonal communication/presentation skills, and management skills.

That said, I have to question the age and veracity of the data above.