expired CORSAIR K70 Lux RGB Mechanical Gaming Keyboard $144 @ Harvey Norman
Cheapest ever price according to price spy. Price is really good for a corsair K70 RGB mech keyboard. Next cheapest is $249.
I have one (but rapidfire red) and can vouch that it's great keyboard. Does not feel cheap (aluminum frame) and feels really sturdy. It has the USB pass through as well if I'm not mistaken because it's the LUX line of K70.
Has really good reviews as well and one of the top rated (usually see it in top 10) mechanical gaming keyboards during years 2016/2017. Please do research yourself as well to confirm.