Try looking for display case's for McFarlane figures. I have some of the NFL ones and they are the same size as the NRL figures. Being US based you may have more luck finding them.
I have a few display units. Paid just under 1k each. But that way I can store footballs/figurines/boots and anything else I want in them. They're 4/5 shelves.. Fully enclosed. And they look great.
Are you going to display it with the original packaging or unpacked ?
You can try one of those small display cases that people put footballs/soccer/basketballs in, or get a shoe box stand it upright and put glad wrap on the front