$650 aud locally
https://addictedtoaudio.com.au/products/etymotic-er4sr-studi…
Seems to be a similar price to adorama deal, but they don't ship here, so would have to pay forwarding costs etc.
https://www.adorama.com/etyer4sr.html?sdtid=14689085&emailpr…
$275 for ER4xr
https://www.amazon.com.au/s?k=er4xr&ref=nb_sb_noss_2