Unfortunately, in most states, a product advertised as a "barrier or security screen door" may only secure you against bugs and flies: the term is meaningless unless the door can be shown to meet Australian Standard AS5039-2008. There's also a standard for installation (AS5040). and you should ask the installation company for a written guarantee that its work complies.
You can buy aluminum sliding screen door for around S250—$350. but it's likely to be little more than a flyscreen. For a custom-made aluminum sliding security door that meets the Australian Standard, you're looking at a minimum of $550.
For more info on your new Barrier or Security screen door requirement please fill out our GET A QUOTE form or dial 0435 806 520.