I also live in Oz (south east Qld). I managed to get an Arcadia 12%D3 tube from Pet City Online in Mt Gravatt, Brisbane. The only hassle was that because the tube was 48" they would not post it. Lucky for me my daughter lives in Brisbane and was able to collect it for me and bring it up to Bundy. It was also $20 cheaper for me to purchase in Brisbane as opposed to buying it at my local pet store!