I'm starting to compile a list based off your input.

For example, the local assessor or tax collection records are much more timely and  accurate, if they are available and low-cost or free, than information from data compilation and reporting services.  

@Jerad Casto My main focus is buy and hold, and @Regina Sitterley that is the plan, but since i've only just started this week, I wanted to compile a bit of a larger list before sending mail.

My go-to for that is PadMapper as it compiles listings from various sources, however I also check out individual sites (CL, Apartments.com, Zillow, etc) for more information.  

Following up on this conversation you all were having a while back, did you all ever compile a list of these portfolio lenders? 

@Robert Mungillo JrAll you need to know about foreclosure auctions on BP can be found in the following post, which has graciously been compiled by @Steve BabiakHappy reading.  

The larger the area measured, the more micro-markets there are that compile that macro analysis.  

In other words it's a guess.There are several sources of data, but in real estate, unless actual owners are contributing to data, then it will be compiled by survey, or by third party observations like Realtors.

I have compiled a list of duplexes in my farm area that I will be marketing to and see if there are any potential deals.

A good agent is out there  that can  help you - compile a list of questions to ask to determine how knowledgeable they are about investments, as a lot of agents have no idea how to evaluate an income property, and will just give you a cap and tell you it cash flows.