Could be a long process.... and is usually played by the big or $$ players.
This is a tricky process and you may wind up in deep waters and over your head. Still the best way is to work with an experienced Buyer's Agent who know the market for investors and can guide you through the shark tanks. Believe me, there are some sharks out there that will promise you the world, do not have your best interests at heart, but want to make the biggest profit they can at your expense. Bust of success and be careful.
Your Castle Real Estate
Public records are going to be your best bet. These entities tend to keep their activities on the DL. I guess I would want to know what exactly is your angle. If you are thinking that you might buy a bargain through one of these companies then you will probably be disappointed as they will price the properties for sale at a hefty profit. You are probably better off buying at a foreclosure or tax sale, but this requires cash on the barrel head. Tell me what you think.