One final source I will give you is signs.

I will have a property or 3 that I've located,  found owner negotiating seller terms,   knowing I don't have the credit or capital or network for sourcing either,   I'd go to sites or platforms that want partners for 50 50 deals..   

There are a lot of investor interest that does not come from BP so I think your sample size is just pooling from one source

BP is another of those sources as you can look at reviews on the profile page and actually talk to people here on BP who have used a QI. 

How about explaining your source of funds for the other $10,000,000 plus living expenses over the last 8 years?

Save your money and go buy a tax lien with it.biggerpockets is a great source for old, outdated, posts that get resurrected.

See the source here:https://www.irs.gov/retirement-plans/plan-participant-employ...Therefore, if your property management company manages 401k-owned property, it would be breaking two IRS rules: - Furnishing services to the plan- Receiving personal benefit (compensation) 

Can I use Solo 401(k) as source of funds to pay 25% down and leverage debt for remaining principal amount to purchase a duplex that I will owner occupy and rent the other unit?  

It's highly unlikely, if not impossible, to find a traditional lending source to fund the purchase of tax deed property. 

I have been trying to source properties by calling on agents to ask if they have any off-market opportunities, however this isn't returning the response I had hoped.