If you're not sure of you preferred direction with your next property I would invest in understanding investing more thoroughly and read 5-10 books as well as speak to other experienced investors.

Can anyone recommend sources for contact information for property owners?

Leveraging our market connections, we identified the property’s potential and negotiated favorable terms directly with the seller, securing it at a highly competitive price.

And I'm sure that's because some people direct book, others use Airbnb, etc.

And IMHO, the prices are dropping big time (on avg. 10K/month...houses that were above 300K a year ago are not selling at 250K now) and the available rentals saturation is worse than I seen during summer season (with rents dropping from 1$-1.08/sqft to 0.8$/sqft and very little contacts and applications...just go in Zillow and look how many rentals are on the market now in Kyle, New Braunfels or Converse). 

But because you rent by the room and YOU SELECTED the roommates (for which the other roommates had no control over), that makes you directly responsible to the other tenants should any harm or damage come to them.  

Marc Mosseau was the leader at this Oklahoma City funding tour I went to and said contact me with my first deal.

Happy to connect you with my contact there.  

Contact DPOR. 

The best strategy I seem to have deployed so far was to contact all my current tenants and let them know I’d give them a cash referral fee of $250 for anyone they recommend to me that goes through the vetting process and successfully moves in.