Seems like this is the current cheapest price for these headphones on eBay, as the Good Guys increased their price since yesterday's deal. Although advertised as box damaged, may in fact be brand new undamaged stock (as per comments on previous Sony box damaged deals). Sony only have the black variant currently listed.
[Box Damaged] Sony WH-1000XM3 Wireless Noise Cancelling Headphones, Black $319.20 Delivered @ Sony eBay
This is part of Black Friday / Cyber Monday deals for 2019