1. Pick a broad industry (say law/attorneys)

2. Go to craigslist for your nearest city

3. Post a job for the category that best fits the industry you chose in #1 above. The post should be along the lines of: "Local software startup is seeking experienced attorneys and legal professionals to consult with. We need help testing our software and validating our new product ideas. We can offer free use of products after launch."

4. You will absolutely get emails back from professionals and business owners who simply want to help and think it's "cool" to be part of such a process.

Have coffee/lunch with them, pick their brain, find their pain points and make a project out of it.

I've got 2 in the works that started this way.