 If you're looking to get some work as a background actor or an extra in films, in my opinion, I don't think you should pay for casting websites to do this because those jobs, they usually need a lot of people and you don't need experience and you are going to get paid pretty much minimum wage. Really popular one is central casting. Central casting is for background actors and they are based out of LA, New York, Georgia and Louisiana. My casting file with Gloria also casting. This is for background actors. They also cast on here featured extras, stunt doubles, stand-ins, New Orleans or the Bay Area to create an account on here and you should follow them on social media. Casting TaylorMade is another one that is also in Atlanta and also very location specific. I'm sure there are a lot of different casting websites that were created for local markets that you might be able to find.