I always did my advertising via my Webpage, or newspaper, or rental agencies. 

(Wholesaling can be a gray area here - when wholesaling you are generally selling your own equitable interest in a contract - wholesalers should be careful not to market/advertise properties they don't have an interest in, and some states are cracking down on this).

During the escrow process he places an ad in Craigslist advertising this home for sale for $60,000 for NO MONEY down.  

I get emails from all sorts of wholesalers with some having decent prices and others properties being advertised simply not meeting my criteria and I have convinced myself that I may have to do more rehab than I wanted to do previously.

I have started to advertise my units in Ukrainian Village in Chicago which will be available March 1 or April 1.  

I was also advertising the place as a FSBO for like $250 or $275K. 

They advertise all over BP.  

I got a call from an angry mortgage broker telling me she intends to turn me in for advertising private loans.

BP frowns upon advertising companies in this forum.

Since your unit is an apartment building you might consider advertising in an apartment book.