I was in the Corelle store at the DFO at Moorabbin today and I noticed they were having a 30% off on their Instantpot Duo's including the Crisper version.
Standard Duos
https://files.ozbargain.com.au/upload/157591/87637/instantpo…
Duo 8L - $188.30
Duo 5.7L - $160.30
Duo 3L - $132.30
One with Crisper header
https://files.ozbargain.com.au/upload/157591/87639/instantpo…
Duo Crisp Air Fryer - $272.30
Crisper.
https://files.ozbargain.com.au/upload/157591/87638/instantpo…
Vortex Plus 5.7L Air Fryer
There is probably cheaper out there but there is stock there now for pick up.
From your pics, "Standard Duos" that you mention are mostly Duos, but the smallest one is Duo Nova.