Gen 3 Water Pump & Inverter Pump - Preventatively replace? Aisin? Where to buy?

Hello all,

I have a 2009 Prius Gen 3 (I think in the US 2010 was the first year for these), and have been a long-time lurker here.

I have about 150,000km (~93,000 miles) on the 12 year-old car. Have given EGR cooler, valve and intake manifold a good clean, and replaced PCV valve before anyone mentions it haha!

Basically I am having trouble finding some sort of consistent answer to these questions:

1) Should I preventatively replace the engine water pump and the inverter water pump? If so, would now be a good time? 12 years / 150,000km (93,000 miles)? I would ideally like to keep the car until 2029 (so another eight years or so, when it will be twenty years old).

2) I have read around the replacement Aisin pumps you can buy from their amazon store etc. might not be as good quality as the pumps Aisin supply to Toyota and have a higher failure rate? Does anyone have an opinion/knowledge of this? Or has used Aisin pumps?

3) Has anyone got any good suggestions on where to get good genuine Toyota parts online? I feel like the Australian dealer prices would be an absolute rip-off.

Any ideas would be greatly appreciated!

Kind regards,
Rudy