I think most of these LOC are probably asset backed.you can stack up credit cards .. although if you max them out your fico is going to dive so your refi could be tougher or interest rate higher. 

My wife and I currently have about 60k debt (mostly car notes and some credit cards, not including our primary home) and not much saved (we’ve been aggressively paying it off).

One that resonates with me in particular is using Business Credit or Credit Cards to make a real estate purchase under my company instead of my own personal name.

Use 0% for 15 month credit card to finance 10k upgrade. 

Are there any lenders out there that would allow the down payment on a flip to come from a personal loan or credit card?

I just had a 1300 sq ft one bedroom 80% furnace/central air unit replaced it was $3400 installed (included up charge for using credit card).

(I'm guessing pokemon cards are out! 

Our aim was to use a 0% interest for 12 months credit card to fund the staging, but we actually went a different route.

She either used a stolen card or lied to the credit card company about the fraud, which is itself fraud.

The money for maintenance and capital expenses can come from several sources such as 1) cash reserves that literally exist in an account somewhere; 2) "good" money you have access to such as a home equity line of credit; 3) "bad" money you have access to such as a cash advance on a credit card; 4) funds you are building up each month by setting aside (again literally) money into a rental savings account or your rental checking account; 5) payouts from a home warranty for specific items covered by the home warranty.The amount that I set aside each month can vary depending on the amount of rehab that I have done to a property before renting it out.