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OSPi has a switching regulator that generates 5V DC from 24V AC input power. By “single power supply” it means the same 24V AC power is used to drive solenoid valves as well as powering RPi.

Thanks for confirming this.
What sort of amperage is needed to power both (RPi + valve) using a single 24 VAC power supply ?

I’m also in Australia and the choice is rather limited. I just found these 2 PS:
24VAC 1A
24VAC 3A

Which one would be better ? (I have a RPi 3 B)

Thanks !