Try Craiglist for job listings...
Also, look at the after-school teaching/tutoring centers. I taught at Sylvan for a while, but there are a few others now. Sylvan, last i heard, was wanting incoming tutors to have their teaching certificate. When I started there, they didn't. I could, if I chose, pick up at one around here. Heck, I even got offered a post at one here just going in for my GRE's, and mentioning i used to work for other centers. I said I'd think about it. Hmmm... Maybe I should reconsider...
It's teaching experience, maybe not in front of a classroom, but it's experience. And you get to learn a LOT about patience. You're dealing with mostly troubled kids who are having issues in school. I had a tough time as well, so I knew where they were coming from.
Craigslist job pages are a decent resource. I've found more listings there than any of the major sites. www.teachers-teachers.com
is another site (I got an interview off of there once)... mostly for credentialled teachers, but some other stuff as well. And do check with your on campus job center... that's what they're there for.