Why would anyone want to spend time working anything that was free. If they have no value to the person you are getting them from, they why would you think they will be valuable to you?
One way to get "free leads" walk into a business and say to the receptionist/ gate keeper..."who makes decisions about ......." and when they give you the name, that is one "free lead" except for your time spent. Repeat process until you have enough names to call back and attempt to make an appointments. After you make an appointment, go see that person / business to see if you can be of service
This is an ongoing process which will continually give you free leads or a name of someone to contact.