Your best bet is to partner with someone with a great deal of experience.

Your best bet is working with a licensed agent who can pull accurate MLS data and understand what you are doing... 

Now he uses property managers and I would bet dollars to donuts those professionals aren't offering cash for keys.I have 15 years experience managing 400 rentals and I have never offered cash for keys.

Bet, they will say: “I want to keep my house”.Do you all understand you are targeting the wrong people?

Your best bet might be joining a local real estate club.  

I just checked out his web site and teasers.

As low as the market went for mortgages and housing shortage, the only sure bet in my opinion is housing prices will continue to rise. 

Your best bet is to ensure that there are no material modifications that would in any way harm or even moderately delay the ability to rent it out and qualify as a normal SFR (one lease, one family) or sell on the market to an owner-occupant

Best bet is talk to wholesalers and have a real good agent that can dig properties out, and be prepared to buy on spot in good locations and anything else be a tough cookie.

Try searching buy house with section 8 voucher in "your state" and see if your states web page pops up with this information.