From what I've learned Goettl is by far the most expensive due to the massive advertising budget expenses. 

Question is pretty straightforward, I live in the Bay Area and see numerous MultiFamily properties advertised for 5% Cap Rates and below.

Buying up all the down town abandoned buildings I can.

Many wholesalers now are just doing robo calling and trying to get folks on the phone I get one to two of those a day.. most I don't talk to some times I will .. many of these are using off shore call centers so semi broken English reading form a script.. but they produce leads.. its just like buying a car.. the sales guy ( telemarketer) then hands you off to the closer.. then you have the I buyers backed by wads of VC money big advertising budgets and super sophisticated web sites that spit out automated offers.. the business is changing no doubt.. and there is no doubt like Will Bernard stated its probably the toughest thing in real estate to master ergo 9 out of 10 never get past first base.. 

I am a RE investment instructor in the DFW area and I specialize in locating owners of abandoned houses.I am hesitant to say too much being new to this site because I am not familiar with all the posting guidelines and/ or differing state laws.Public data . com is a GREAT website for helping me locate owners but it is limited to certain states for pertinent information.

A free FSBO website with a high rating on Google is www.HomesByLender.com - no fee, put as many pictures as you want, your own description & then advertise your specific property on www.craigslist.com using the www.HomesByLender.com website address.Good Luck & all the best,Roz

i have advertised on Craigslist.org, and have a big For Rent sign in the yard.

I know, I rescued a tenant's dog one time that had been abandoned without food and water and got it.

So here are the types of advertising medias that have proven to me to be outstanding with percentages NEWSPAPER DISPLAY ADVERTISING 43% of your business will come directly from display ads.

Then use the standard traffic driving techniques to drive traffic to your site.You can also advertise with REIAs around the country.