If you live in the southern states and wanta get acting work in indies and non-union stuff, there is a website that lists a lot of extras work and indie casting.
It’s called Southern Casting Call
I don’t see hardly any union projects mentioned there except for working as an extra on a few (they list the Nashville show sometimes, for example) but for indie work in the south it may be a good resource for non-union actors to get some exposure and some stuff for their reel.
Just do your homework. Make personal contact and email back and forth with questions until you are satisfied that the project is legit. Ask about travel stipends and lodging potentials if traveling. Ask your friends in the area if they know the people involved.