Cross domain Google analytics set up, with Goal tracking

Hello, I am looking for a Google Analytics expert who can install my Analytics properly, to track the original referrer between 2 websites, so I can see where my sale came from. My website is here - [login to view URL] I can add Google tracking to the checkout pages (different domain), however it will not track the original referrer for my sales. I will pay 25% upfront and 75% upon completion, please include any websites in PM that you have worked on regarding Google Analytics. Thanks.