If you're currently working at another company, you can approach co-workers who are your friends. But be very careful with this... This could be used as evidence that you are violating an IP or non-compete agreement.
If neither of those works, might want to check out computer science career fairs at a few of the good universities. Some of the guys graduating could be quality hackers willing to take risk.
The traditional means recruiters use to get Sr people (like LinkedIn) might turn up people who cost too much (and generally suck), but could still be worth a shot.
Good luck.
In fact, that's probably the main reason startup hubs tend to form around universities.
It seems to me that the answer is always "find someone from your school or else you're doomed." I give up on that.
To date I've had most success with craigslist ads. Cheap at $75. But you need to be very clear (not like your typical job ad) in your posting to make sure you really get what you need.
Good luck!