[jamilv]

Linkedin, go to local startup meetups or look on meetup for marketing groups that do meetups (there are TONS!).

If you have the connections ask your friends/colleagues/acquaintances for a referral to a marketer they know.

I'm a marketer and I focus on these channels heavily.

If you are able to manage well and are up for the challenge of negotiating, try one of the online co-founder matching sites. They match people from all over but the main issue is always finding someone that shares your passion and will work hard to make the startup live.