Hi,
A few important points:
1. The main question is WHY haven't you found a co-founder? Is it because the idea isn't 'good' enough (at least in their eyes), that you're not presenting it well enough or maybe that you're not pitching the idea to the right people? It is important that you first discover what the reason is, because that way it will be easier to find the right solution. If it's a pitching problem, I can help you improve your pitch. If it's the wrong people, you can network in other areas/groups. If it's the idea, I can help refine it.
2. It is important to understand the above because if you can't recruit a co-founder, you may have similar difficulties raising capital from investors - the reasoning being that pitching to a co-founder is very similar (even easier) that pitching to investors. A co-founder invests time and efforts. An investor invests money - but both are taking a risk and therefore have to fall in love with the idea or the potential for profits.
3. Meeting co-founders: chat on forums, go to network events (check Meetups.com), and consider using a service provider for your initial co-founder needs.
I've successfully helped over 300 entrepreneurs. I'd be happy to help you. Good luck