I don't have much cash to put down for a property and don't have anyone to rely on to borrow capital.

We lost about $100,000, which we had borrowed from family.

My question again stems around using seller financing to allow them to receive a consistent monthly pay of X amount and delay/lower their tax bill in the short term instead of going through a lender to borrow 800k+ causing my mortgage to be significant part of our income roughly 40-50% of take home -  which we are approved for LOL.

what you're proposing is, again, borrowing 100%.

Quote from @Brandon Croucier: The loans are available but nobody wants to do them.There always seems to be something wrong with the properties, as lenders we just can't make enough $ for our time.9/10 Borrowers also complain about the "excessive fees" for the loan amount.If you are okay with paying 8k in closing costs then the loan is available. 

Don’t forget heloc, DSCR, 2nd on primary, borrow from retirement accounts, credit card cash advance, property reserves, home improvement store credit, etc etc.

There will always be posters who come out of the woodwork who claim to be able to beat terms or meet borrowing expectations.

What is the best way to show cash in hand in order to buy it when you don't have the cash and need to borrow the funds?

It depends. all you talked about was the property but financing is more about the borrower, their experience, their credit, the cash available etc.

House gets foreclosed on when a borrower is not paying its debt obligations - typically its mortgage.buying foreclosures is not for the faint of heart as you have no idea of the interior of these properties lastly while it can be beneficial also realize if there are a lot in an area those homes are the new comps when trying to sell so it lowers home values in an area