Newspaper, craigslist, bandit signs, whatever it takes.  

@Alfredo Chavira,I'd recommend keeping your cash for now, and learning how to find and engage private lenders.Many investors - both newbies and veterans - use other's people's money and credit almost exclusively.

I aim for the 2% rule and deal almost exclusively with low income multifamily, so my risk of getting upside down cash flow wise is low. 

I work with a property management company that exclusively uses rently.

I'm not a huge fan of ZBuyer because the leads aren't exclusive, but those leads are cheaper as a result.Otherwise, here are the most productive ways to market:1) ADWORDS - just need an account and a landing page for lead capture2) DIRECT MAIL to specific groups such as absentees with high equity3) OUTDOOR - billboards, bandit signs, car wraps, etc.The TV idea from Erez above is a good one - you can actually do some pretty targeted advertising with cable TV and a good ad is a call generator.  

I know a few wholesalers that use them almost exclusively

BUT,  under Turnkey, you wrote:  Operator manages the asset in-houseNo MiddlemenAs far as I can tell, those two terms are mutually exclusive.

Given that it sounds like you are exclusively helping buyers, you sound interested in becoming a buyer's agent.

You may be the first.That being said, tucking it in a door, putting it THROUGH a mail slot that is actually cut in the door, or putting it in their newspaper delivery box is more effective than using a mailbox and doesn't break any laws.However, hand delivery is very time consuming and expensive and probably not incrementally that much better than a mailing. 

I work exclusively with investors who want to invest in the Kansas City area.