How to find equity information for select properties

[Tehseen Baweja]

I got tax delinquent property data from my county, did a lot of cleansing and parsing and came up with a potential list of roughly 1200 properties that I want to send yellow letters too. But I want to check if they have any equity or not! How can i go about doing that?

If I try Listsource and pick everything in my county with desired equity levels, it comes up with 15,000 entries and would cost me a fortune to buy ($2,000+)

Is there any other way to see how much equity these properties may have?