Don't know whether the Remington Nitro Steel is actually discontinued or just permanently dropped by our importers.
Same result at the shop counter!

Looks like Falcon is stepping up though.
F&OW even have some specialized steel loads for magpie geese from the kiwi maker that have been delivered in unmarked white boxes, only available in the Top End!

For whistle ducks, there are several choices for 2 3/4 chambered CIP-proved shotguns including the aforementioned Eley VIP Steel.