This is everything from tax, to legal, SDIRA/Solo 401(k), creative financing, market updates, software, mngt, etc. 

@Shannon L Fogarty the tried and true technique here is to ask other investors in your market who they are using.  

Given the state of the stock market over the last few years, I'm looking for a way to invest in certificates to gain an interest rate higher than what banks are offering and returns that higher than the stock market right now.

I found it online and negotiated with the property owner.

I predominately work with out of state investors looking for cash flowing rental property in our market. 

However, I am trying to accomplish this task by purchasing under market value (every investor dream).

Different markets have different strengths, and as I understand Detroit is a strong market for cash flow. 

The current market value of the NC property is around $260k, with an outstanding mortgage of about $160k, resulting in approximately $100k in equity.My current residence in Beaufort, SC is a 4-bed, 3-bath house with a higher interest rate of 6.5%.

What I mean is this Money market at Bank of America pays for instance 4%, the money market local Bank of Bricktown Pays 4.5%, an online outfit is offering 5%.

Those sales may happen off market between you two, or may have creative terms, but really you're negotiating two separate sale both of which only happen if you both like the terms.