You are basically taking out a loan for personal use, just as you would spend money out of the credit card to buy a food. 

You may need to open a credit card or two to finish it up.

And we live in a area where there are so many small businesses make some flyers and ask to hang them or leave business cards!

Your final considerations are Credit Cards or a HELOC but do their benefits carefully and pay them off in time. 

Examples: A guy with hotels who used business /personal credit cards for free flights, a guy doing private investing/hard money lending, and last month was a guy who told the story of a 12+ property deal spanning 2 states and 1 primary residence of the seller.  

This distinction if of course most important when you need to use cash out proceeds to pay down credit cards used for rehab or keep the ball rolling and re invest for more flips/investments.  

I have already discovered they don't answer their phone, don't have website account access and don't take credit cards.  

I would find a secured credit card with the lowest interest rate as possible.

I would hold back in cash the rule of thumb percentages each month, but have a credit card or line of credit available for the unexpected. 

It ihas even been expressed by some attorneys that contributions can not be taken with a credit card.