You can likely find this information in the local public county records.  

Finding homes to flip in this condition can be done through popular online listing websites or through manual and creative methods like searching public records and advertising on signs.

The corresponding downside is that you can't publicly advertise and must have a pre-existing substantive relationship with investors. 

Congratulations :)First, never tell people in a public post how much you have to spend.

THAT is why I give them an earful.It is time people come forth  making it public that when they tried those crappy methods, they speak out loud that it didn't work.

I'd love to be on the opposite side of that.One thing I heard from a real estate agent is that some of those guys have already pressed the button but are going strictly off-market to prevent people knowing their selling publicly and to cause that glut. 

In my due diligence period this is my current list -inspector/contractor walk property-get lease terms -Get Schedule E form -Check Public records -Any Liens ? 

If in a dense block you might have to go through a public hearing about parking and density and whatever the neighbors want to complain about.

A great realtor can probably set up a better and more detailed search for you with all the parameters you want vs any of the public facing websites like Z you mentioned.Also depends on your budget and borrowing capacity as to what you can buy....so again building a team is important and the very first step is getting a great lender on your team who can get you prequalified for a loan....and then you can go shoppling.

Substantial services don’t include the furnishing of heat and light, cleaning of public areas, trash collection, etc.