Google Finding a Justice of the Peace. Each State has a list on the internet and you can search for those in a suburb close to you. All they give are phone numbers so you can call them and ask.

Most JP's do not charge as they have volunteered to provide a service to the community. My DH is a JP Qual for Queensland even though we live in Victoria at the moment. Back to QLD in January.

Are you sure you need a JP? If it needs to be a certified true copy, I think your local police station staff can do this (but please confirm before going there).