I was curious about this, so I did a quick check.

https://www.amazon.com/gp/aw/d/B099CHFN88/

vs

https://www.bunnings.co.nz/ryobi-18v-one-hp-brushless-circular-saw-skin-only_p0291681

Amazon looks cheaper initially, but after factoring in shipping, currency exchange and GST, the end result:

Amazon = $309.76 NZD

Bunnings = $299 NZD

So I’m a little confused where you are getting “less than half price” from?

Are you getting refurbished models?