Are you into marketing? Many enterpreneur conduct direct marketing via direct mail, email or telemarketing. Some people use a list broker to make this step easier. A list broker acts as an agent for those who wish to conduct direct marketing and most of the time, act as "go-betweens" matching list owners to those who wish to buy or rent lists, receiving a commission from the list owners. List brokers provide lists that, minimally, contain a prospect's name and contact information and other additional information such as age, sex, etc. You can shop for lists yourself, but marketing work is easier if you can find a competent list broker to find appropriate lists for you and negotiate on your behalf, with your best interests in mind.