The same deal as https://www.ozbargain.com.au/node/799071 appears to be back. Previous OP said: "Decent pair of TWS earphones. Batteries are also very easily replaceable."
Silver colour also available
https://www.ebay.com.au/itm/284926069889
Where do Sony get all these refurbished earphones from?
I have these (and also several of the later versions as well). Only thing to watch out for is that they're pretty big - both the case and the actual earbuds are much larger than the XM4 and XM5, but the sound quality of these are really great. $100 is absolutely a steal.