How do I find leads to start a direct mail campaign

[Quentin Hamilton]

hi I'm just wondering how do I find leads to start a direct mail campaign I've done about ten or eleven wholesales deal since I started in July using the 25 to 1 strategy and bandit signs but I'm looking to grow i heard direct mail is the most effective way to market but do I have to  buy leads or is there a way I can find them on my own.