Finding Sales people

So I have a 3 year old website that averages 7000 uniques day and a user database of around 200,000 people, 100,000 of whom have signed up to receive newsletters etc.

i've heard from people that you can sell an advertising in a newletter anywhere from $0.10-$0.20 per email. is this true? if so, where can i go to find a solid sales person to find me customers for that kind of advertising and also to sell advertisement on my website for me.