A few ideas for lead sources:Drive for dollars, then cold call the list.Get a list of houses in foreclosure from court.Try to get the "hard to get" lists (ie, where you have to go in person, not available online). 

I rented to my parents for 15+ years and when they past I rehabbed the house and sold it for $120k profit.

I would stay away from Facebook Marketplace, it was a crap show the couple times I threw a house up there, but that's just me. 

Say I bought the house cash thru HELOC, have it rehabbed.

House was in bad shape with outdated carpeting, wallpaper etc....

Why do people every day trade in their car for $10k to 15k less than what its worth to the new care dealer??

I still believe he’s better off with someone licensed in that seat to avoid any potential fair housing or other liability issues that can occur.

Many may have debts and hardships that force them to get rid of their house.

When I bought my second house hack, I was in way over my head, created more debt, and stress.

I never regretted keeping my first house as a rental because it cash flowed very well from the beginning and as years passed and rent increased it became an outstanding decision .However, our home was significantly less expensive than yours.