How do I find successful people to interview??

Hello everyone ,

I am working on a book about motivation (my first to be exact) and I would like to know where can I find successful people to interview them. I do not just want people in the Internet Marketing Arena but I want oridinary people who make good money from the web selling all kinds of things from thier own crafts to thier own home-made How-to kits. These people I am after have to be making a good living from the net (with traffic and sales) not just skimming by.
If someone can direct me to the right place ,I will be very happy.

Thank you in advance

kelle