I found this deal on eBay which has an instant rebate of $250 bringing the price from $699.00 down to $449.00 then using Afterpay at checkout to get another 15% off again to bring the price down to $381.65.
Previous Roborock S7 deal:
https://www.ozbargain.com.au/node/762579
Also available plus version $997.95
https://www.ebay.com.au/itm/175035998312