I went into my local Jaycar to get more solder and lo and behold the Logitech MX Master 3S is on clearance for $84.50.
Talking to the manager of the shop, it seems like Jaycar are clearing out all Logitech products. Get them in store while they're hot!
Update: From comments, it looks like this might be a Bathurst/Kelso only deal. Sorry everyone!
Still 169 on the website. You can only see the clearance price in-store?