I am unsure how to best find a source of inventory for deals.

@Christopher DavisRecommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

Hello Francis,Skip tracing services charge fees because they aggregate data from multiple sources, often including private databases, public records, and proprietary data, to provide accurate and up-to-date contact information, including phone numbers associated with a property.

I'm wondering if it would make sense to source modular homes in China and have them shipped to and assembled in markets like Memphis, Atlanta, Birmingham, and other where you can buy vacant lots with utilities for as little as a few thousand dollars.

In addition, Read up on the recent court decision about buyers agents sourcing their own buyers agent commission from the buyer.  

Is there a centralized place/website that one can go to, to be able to see all the relevant metrics that one would need to know before they make a decision on whether it would be a good idea to invest in a particular ...

I am an agent in Hudson and Bergen County and I source off market deals to developers, especially in Jersey City area.

That's why I was asking.That estimator was not a good source to pull from in my opinion. 

They can be a good source for vetted contractors.

Source deals, source capital, and network.