Many services offer this, a simple google search should find you a firm. 

The tenant toured my place, said is employed (+i googled) , came across to me as very polished  and came to tour the unit with her mom.

A quick google search says they may or may not but would have to provide extra paper to find out.

Do they have any google reviews or a presence online?

I did see the area on google maps and saw that the roads were not paved.

You are doing an incredible service to others.When I googled “Tax Lien Buyers Club” your post was the second result after their own website - the beauty of the internet is that Tax Lien Buyers Club can’t control the search results, as it is objective.I have never heard about Tax Lien Certificates before yesterday morning.

Other than networking and searching for "Wisconsin Real Estate Wholesalers" on Google, does anyone have suggestions on how to find wholesalers in my area? 

See what's for sale and begin plotting price points and rents on a google map. 

Having a google voice number and littering some stupid and ugly signs on telephone poles does not constitute starting a business.

This is particularly important as I prefer to self-manage properties, and accurate cost estimations are crucial for maintaining profitability.Scalability: These rules help in maintaining a consistent evaluation metric across multiple properties and markets, aiding in scaling my portfolio systematically.That said, I understand that each investment should be evaluated on its own merits and that these rules may not capture the full picture.