Here are the exact steps I would do in your case.1) join a local Real Estate Investing Group (you can find a good meetup in your area)2) contact local real estate agencies via email and let them know you are an investor that needs an aggressive agent that isn't afraid of making lowball offers to sellers.

If the supply is tight, then buyers will be more likely to overlook a modest eyesore.

They thought they had to supply the toilet like you have to supply the stove/fridge?

.- Accounts set up with supply companies like Wilmar and HD Supply?

I went head to head with them.. but then when they knew I was not leaving and I had as much if not more purchasing power then they did.. we ended up partnering up on everything and that was great I just supplied money they did all th e work we split profits prorata to our invested dollar .. did that for 5 years.

Yet, to do so, I need to be a more bit aggressive. 

Demand will always outpace supply, always.

Depending on how many units you're buying for every year you may be able to open an account with companies like Wilmar and HD Supply.

I still keep some of my SFRs because in our town demand clearly outstrips supply and hence are appreciating very well and mine are hassle free.  

Our counters in our kitchen are also pre-fab, but we got them from a builder's supply place many years ago and they're out of business.