I constantly run ads on Craig's List for Property Finders under Real Estate Help wanted and also under sales.
I used to split profits with them but now I offer them a flat $2,000 finders fee. I can't rely completely on BD's bcuz 99% will flake out. Most will never get started, some will send a few addresses and every once in a while I'll get one or 2 that will really put in the effort and send me hundreds of addresses. I try to explain to them, that 98% of these addresses I cant do a deal on, and that's why it's a numbers game.
I estimate maybe 30% of my deals come from Bird dogs.
I also do the direct mail, bandit signs, door knob hangers, networking etc.