Email Marketers for ecoomerce site

We sell products at $29 to an audience predominately female between the ages of 25-60. Our markets are UK, AU, CA and USA. We need affiliate type marketing to exponentially increase our database and related revenues. We are interested in offshore email blasts that deliver real, quantifiable results. We will not pay upfront but are willing to commit significant cash for results on a monthly basis. We want to pay on a cost per results basis.