So far ive been asking personal contacts.
Anything Goes : How does one go about building a crew? by Immanuel Baldwin
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You can try some local film schools.
Volunteer on other productions, be awesome, and make contacts who like working with you. Working with your friends is a great way to get a substandard crew and lose friends.
if you're in LA I can't recommend film independent enough - great networking opportunities (and no i don't work for them!!) http://www.filmindependent.org/
That's the best way - people who've worked with you before, and want to work with you in the future.