Matt, depending on where you live and your line of work, there might be some options locally for you...
1. A local Chamber of Commerce - Many have small business programs, and if not, might be able to point you in the right direction.
2. Respected local businesses in your community - While they might not quite fit with what you are trying to do, a seasoned business owner in your corner couldn't hurt.
3. Any service providers you have used - Folks (you trust) who make a living working with other businesses (accountants, bankers, lawyers, etc.) might be able to suggest someone in a similar line of work.
Keep in mind that even mentors are just offering opinions. The final decision with your business always rests with you. Cheers and good luck!!!!