Wish I had more direct insight from experience, but being in your shoes right now, the best thing you can do is be persistent, follow your dreams and always continue to learn more each day!

The market is really tight, but with persistence you can make it work.  

The problem persisted, so we  pressure tested all the lines in the house (found two leaky valves - under 100 PSI - but nothing to explain the increased water consumption).Then we found the cause - a disgruntled tenant (who was moving at the end of his lease) who would come home in the evening and leave the bathtub spigot running for an extended period of time (another tenant ratted him out as they were tired of all our intrusions while looking for the problem).  

Be persistent and stoic in your pursuits and you will be rewarded greatly!

If not, I do not know how much effort and resources it would take to buy a list of properties with delinquencies to send yellow letters to but I gather a lot of patience & persistence is crucial with this approach. 

No deals yet but you never know when one will come, you just have to have the willingness and persistence to keep going.

Keep it up and eventually you will see the fruits of your labor, but you have to be persistent and consistent!

Always remember to persist and you will WIN!!!!

Persistence is what matters.

It's not easy but through commitment, dedication, and persistence you can be successful!