Was browsing for a new mouse and came across this on Amazon. It looks to be the all time lowest according to camelx3.
Quick search from staticice shows Umart @ $194. I think Mwave @ $179 is open box.
For those with access to discounted Amazon gift cards could probably save a bit more. OzBargain Discounted eGift Cards Page
I got the Razer Basilisk X Hyperspeed Wireless Gaming Mouse (linked below) last time it was ~$60 and it has been great (purchased October 29th). When using 2.4Ghz instead of Bluetooth on the mouse, I virtually notice no difference compared to a wired mouse. Only annoying thing about it is that it doesn't have a built-in rechargeable battery, so I had to buy Eneloop Rechargeable batteries (and luckily I had an old charger around).
https://www.amazon.com.au/gp/product/B07YPBQSCK/
The best thing about it, and it appears the G502 above has it too, but not as pronounced, is the part extending on the left side where your thumb rests on it, instead of resting on the mousepad (creates even less resistance, and mouse just glides on the pad).