Boyd, my postcards are all printed, in fact I printed them last year. I will be sending them out in the near future, however, you are in Australia and I don't need an overseas stamp, therefore I'll write a postcard up tonight and it should be in the post on Thursday evening.
You can have a Captain Cook and figure out the rest by the replies to your question.
You may even get it on Friday, although Qld is possibly 2 days minimum from Melbourne.
I'll hand write, pretty easy really.
Ps:- Vanbar also have postcard stock these days.