I was researching for my second ERGO keyboard and found Umart has it for $159. Pricebeated (5%) at officeworks for $151.05.
My first ERGO keyboard was also Logitech K860 (still working perfectly). Needed to another office setup and the price is relatively attractive for this particular top-rated ERGO keyboard.
Centrecom and MSY have it at the same price; I don't know how their shipping compares but both offer click & collect, and I'm pretty sure Officeworks will price beat them too.