Looks like the US supply shortage is starting to ramp up here, certainly for the less common ammo types.
I found that CCI Quiet semi-auto is ideal for pistol steel challenge competitions as it recycles perfectly but the reduced noise and slightly slower projectile means the initial 'bang' and echos are fading when the 45gn projectile hits the steel plate to create a very distinct 'ting', I find it easier to be sure of a hit with this ammo than any other type.
"Based on current advice from CCI. Nioa does not expect this ammunition to arrive until the second quarter of 2021 at this time"
I heard that CCI Stingers became unavailable a few months ago too and this will certainly be the case for the more CCI brands as local supplies are depleted.
I expect this to eventually affect every caliber that CCI produce, although existing Australian supplies will be larger for the more common types it seems unlikely that they are going to last for another 6 months (or more).
As CCI comes from Speer in the US it will probably be the most affected company but others will certainly be affected too, reports in the US suggest over a year backlog between orders and manufacturing for some ammo companies, the future is not looking good.