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. 

You want to be able to supply them with online access to their account (not available in QB), ACH payments (not in QB), and hopefully you are screening your tenants (not in QB). 

For example, if you were ok with spending $350 per month for the car and the salesman came back and said “I can get you in the car you want for $377.00 per month out the door chances are you didn’t focus on the price of the car but the $27 bucks per month and rationalized that as two lunches out per month, couple packs of smokes or maybe a round of drinks (depending on where you live) and chances are if you really wanted that car you would pull the trigger and spend the extra $27 per month.

Also, you have to realize that the vacancies have gone down as I build up a more steady supply of tenants over time.

it's really easy... pretty much everything i use is either from HD - 99% or Amazon (shower trim, valve, bath fan, curtain rods, disposals, sink drains, fan timer, smoke detectors)tiles - MS international glacier or metro charcoalaccent tile - Madison Avenue Interlockingvanity - as modern looking as i can get it - vanitytub - aloha - $119kitchen kompact cabinets - usually buy the chadwood, but this was menards their other line (not good for rentals)hardwood - the stuff around $3, whatever color, but i like the natural lookpanasonic bath fans - always, always, always!

Supplies: can of stain, rag.  

Pratyush Singh try modern builders supply, I use the store in dayton and they are very good and reasonably priced.

Just like with the housing bubble, this is a supply and demand problem.