From a Costco Online "Hot Buys" e-mail received on 6th July 2020:
Stanley Classic Vacuum Flask 1.4L Green $32.99
Stanley Classic Vacuum Flask 1.4L Navy $32.99
Price includes delivery
Similar previous deal was $19.97 at Costco Marsden Park NSW:
https://www.ozbargain.com.au/node/530315
Less, if you have Prime…
https://www.amazon.com.au/Stanley-Classic-Vacuum-Bottle-Hamm…