I love this site, Great Information out here, I just want to help someone if I can.......
I know that many people out there purchase leads for MLM from companies such as Lead Power (simply an example), and I have used several lead companies including Lead Power that have provided leads I consider responsive.
HOWEVER, A Team Member of mine was introduced to a lead company that sent them a list of disconnected and invalid telephone numbers and e-mails.
LeadBakery.biz
You can not contact the company, the telephone number on the site is disconnected, the telephone number on the invoice is a pre recorded voice that tells you that the connection is bad over and over.
Just a heads up for those of you buying leads, don't stumble on this one!

An inside....I have a lot of luck with Lead Genie and Lead Overage, if you have not used them, it is worth checking them out!

There is a company that gives away free leads but they only have email address, first and last name and IP address. Is this legal? They always say not to use there name when advertising

I say don't purchase leads at all. You never know how old the leads are, no matter how "fresh" they say they are; you don't know how they go about getting the leads, so even though you are thinking you are doing the legitimate thing, you may get smacked with a spam charge. And even after all of that, people aren't that responsive when you purchase leads, so I wouldn't even go that route.

Your best bet is to create your own leads when starting a business through a lead capture page and advertising and marketing. This way, you know that people are actually interested in you and your business, no matter how remotely. Plus, since they signed up to your site, its no longer spam when you contact them.