Duty free is duty free, it is classed as an international island so enables the duty-free items to be sold.
I haven't been on any cruises that qualify since Covid but they have had the desk just past immigration point in the now long ago past.
Richmond need the win to have any chance of finals but I think Brisbane will be too strong. Sydney are showing some better form for the whole game so it is good for coming into finals
There is a bottle shop on Elizabeth St (181) which isn't too far away, and another on George st and also Pitt Street which is only a block and a half away. The coronation hotel also has a bottle shop on Park St.