If you can withstand 20k into each unit, and 100% vacancy over 12 months roll up, knock yourself out, otherwise I'd tread carefully.

But I'm asking a lot of questions, listening and reading a lot and getting comfortable that I'm going to take my knocks, but as long as I do my due diligence, buy smart and listen to the smarter people around me, it will be a good learning experience.

Door Knock, Cold-Call, Direct to seller mailers, etc...

I usually search for properties on my own and contact the owner via door knocking or sending them a hand written letter.

Just have to go out and do some door knocking and like David said, lots of networking and talking.Connect with me, if you have any questions, I’ll be glad to help you out.

I've tried a lot of sources craigslist , door knocking , mailings , etc 4. monthly advertising form multiple sources would be around $400 total per month 

Use a process server who will knock on their door and hand notice to them.

To me, that knocks out a lot of good areas where rentals are strong and there is decent money to be made. 

Is my only option door knocking or direct mail?

Unfortunately in my situation I just can't afford for now but in maybe 3-5 years I am sure I can work hard and make it profitable again by adding new products, add more service ..etcSo instead of worrying that the banker will knock on door and found out that I was no longer there. 1.