What are your unordinary/unusual suggestions for finding a technical co-founder?

I know a similar question has been asked/answer before, but thought I'd ask to help others out.

What is a tried and true way to find a technical co-founder for a start-up you're working on?

Let's say the person has not just an app idea, but a live app in the App Store, a business plan, 10k+ downloads, traction, and revenue.

Although this question has been asked many times before, I'm wondering if you have any unordinary/unusual suggestions.

I appreciate your help and hope others can also benefit from this question too!