Best way to find students to be campus ambassadors?

<p>I'm working with a few recent graduates on building a website, Teespring.com. Our site makes it possible to create custom t-shirts without having to pay upfront costs or guess at order sizes. We know it would be useful for college students making shirts for their clubs/events/etc and would like to hire campus representatives to promote the use of our site at their schools. Though, we're having trouble reaching out to student to present the job opening. Any suggestions?</p>