No such thing as a legitimate Aussie seed bank. Seeds are illegal in Australia, for any purpose. You really dont want any of your details with these people.
Use the normal ones like Attitude, Seedsman, Midweek song. Or any of the specialist breeders like MNS, Bohdi etc.
Keep in mind that their has been more attention on the post during covid so some seed suppliers have stopped shipping to aus for the time being. Any post coming thru Melbourne is hard. Always tick guaranteed delivery.