wow why is it so complicated even small communities in Europe don't have this problem
Shipping times from Israel to Australia can be in excess of 2 months, especially now with fewer ships going to ISrael + Suez canal issues.
Even in a normal year they need to ship goods +- 2.5 months before pesach to get there in time - and pesach production is only starting around then.
Many times part or all of pesach shipments don't make it in time. It's especially problematic in Perth, where I have a brother- and sister-in-law. They often have shortages before chag - then a sudden glut of matza meal a month after pesach!