I would be really careful about giving him credit cards to purchase supplies.  

This is the place to celebrate those wins!

The property card shows the square footage for the whole building and the number of units.

I get 3-4 per month and they are hands down the largest type of mailer I get after post cards but the post cards vary so much it's hard to lump them all together.

It's all about finiding and negotiating a win-win for each party.

Bought Property #2 for $36k and currently have $5k worth of renovations on a 0% credit card till October 1st. 

But some times we can have multiple buyers, know their criteria, but when we do our marketing (yellow letters, post cards, bandit signs, etc.), we don't know which motivated seller will be calling us that would have the type of property your buyers want.

Checked my credit card and saw that they charged my card earlier this week.

I pay the contractor or subcontractor based on jobs completed (typically in three draws), and I make sure the materials are chosen by me or by a designer (low cost) if high end.Once everything has been detailed, I send the contractor to home depot to pick up the materials as needed (home depot usually calls for my credit card when the contractor is checking out) and the billing for materials is handled through my home depot card. 

Get yourself some inexpensive business cards, and say something to the effect of buying and selling mobile homes.