I don't invest there (currently) but Columbia continually shows extremely strong data.

You go to the internet.Well, guess what So does everyone else including actually MOTIVATED sellers.The ONLY way to reliably get in touch with motivated sellers is for you to make it extremely easy for them to find you.I call this "stalking the watering hole".SEO is obviously the best, but  PPC and Facebook ads (a service I do not provide... meaning I am not just saying this BECAUSE I offer SEO) are the next best thing each with advantages and disadvantages.Now, you are better off investing in an ever working lead generation system so you can automate this to generate the highest quality leads for free, than investing in a list, no matter the list and every single time you send mailers you have to 1) Hope they see the mailer2) Hope they open the mailer3) Hope that when and IF they open the mailer they are in the mood to read it4) Hope that when they 1. find the mailer, 2. and hopefully open the mailer, and 3. hopefully they are in the mood to read your mailer, and 4. they are coincidently in some sort of motivation state to act on the mailer, they will give YOU a call when they have received 400 other mailers from other peopleYou do realize that 50% of 50% is 25%.

I found one had been sold, and I was extremely surprised to find that there were none for sale at all. 

I'm extremely open to changing my mind though, SEO just keeps pulling such amazing results.

Here are some extreme cases that are mostly 21st century issues:- cannibus is legal in many states.  

That is not enough income to satisfy any lender unless you live somewhere that you can purchase $50k-$100k properties. 

Anyone have great experiences with highly efficient, extremely effective PMs in the area?

Yes, I've closed on 4, rehabbed them, and they are all rented with tenants in place :)OK, and for these deals, I assume you use your own funds to acquire and rehab.With private money, you're now substituting some individual's funds for your own.However, unlike when it was just your money, you'll need to proceed with extreme caution to make certain your lenders are well protected if/when things don't go as planned.Private lending is its own whole profession.

I’m looking at private lending to flippers with a line of credit or using a line of credit to put a down payment on a new cash flowing property (which is extremely hard for me to find right now) but with a line of credit as a down payment I would be financing a new property at 100% at unfavorable rates.

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.