Welcome to Just Answer and thanks for your question. Are you asking about the cost of using someone at Just Answer or hiring a local genealogist in Australia?
Considering getting someone in Australia initially
Most genealogists work by the hour with $25 per hour as a low starting point and ranging upward from that, whether their research turns up anything or not. Transportation, parking fees, copying fees, and other expenses are on top of that. Just Answer does not recommend specific genealogists since we have no way to check their credentials.