Not historical cheapest
Sony xm5 in black or silver at good guys click and collect.
Delivery for me is $8
Cashrewards has a special at 12% today only with ATV20 coupon. It tracked at 59.89
https://www.ozbargain.com.au/node/765698
This made my xm5 purchase including delivery at approximately $388 from good guys
Fantastic pair of headphones. Use them every day and they never miss a beat.