Consider talking to marketing professors for recommendations. I've found that professors in general are pretty receptive to giving free advice and help though the obvious caveat is that book smart doesn't always translate (try meeting with them during office hours - they may even provide you with some free advice).

If you're really lucky you'll find a prof who is willing to use you as an example for a case/class in which case you'd have exposure to a number of business students who might end up being interested in working with you after.

I would also clearly define whether you're looking for someone who is strong at sales vs marketing as the skill sets are different. You may find better and more driven candidates in sales at a technical college.