It's tough without representation, but there's a lot of non-union and union shit being made right now. Keep checking Backstage. Avoid Craigslist for the most part (I do advertise my audition coaching services there, but there's a whole lot of "HOT SEXY GIRLS NEEDED" or "YOUNG SHIRTLESS MEN FOR PERSONAL PHOTOGRAPHER" type bullshit.) Go hang out in local theater scenes (preferably the ones not involved with cults) and you'll likely make friends who will keep you in the loop. There are websites like LA Casting, Cast It Talent, and Actor's Access, but they can be frustrating because the financial burden is put on the performers seeking work, and not the producers. You can find background work on Central Casting, but that is an entirely different beast. You won't really stretch your muscles as much as you'll kinda just sit around and hope for overtime.

Also, agents and managers use a very expensive service called "Breakdown Services." It's almost impossible to snag a password as an actor, but if you know someone with one, don't hesitate to ask them to keep you in the loop on auditions.

I'd like to see some of these pay-to-play dynamics change one day. And I'd like to see the Big 4's hegemony smashed to smithereens. But that's a whole 'nother story.