Looks like the above would be better off applying for a 408 visa if working in TV. No need for an agent.
Before a film producer can apply for this visa they need the approval of the MEAA. quite a burden of proof of "net employment benefit" to Australians etc is required. The actual visa process is straightforward once you have paid the MEAA and got your "non objection" letter from them.
Total cost? $360 for the visa, $110 for the MEAA last time I did one of these earlier this year. The rest would be going into the agent's/lawyer's pocket.