Ok, looks like it's ATL if you don't take the deal that was not honored by JB Hi-Fi into account.
Amazon shows $998, which is pretty good, but if you search for the same product in Amazon Business (looks like you cannot link it directly), it's $896.14. And, if it's your first purchase before EOFY, you can use 30% off up to $100, that brings price to $796.14.
Amazon Business registration and first purchase deal post
Additionally, you can use Amazon giftcards, for example, from Macquarie, with 3% discount, that brings price down to $772.96.
That's Garmin store on Amazon Business, so hopefully they have enough stock.
Users who wish to Block "Amazon Business" deals can do so by clicking on the Amazon Business tag, then clicking the 3 dot menu, then clicking hide on new deals and/or front page. Ensure that on the home page, the new front page is selected for customisation to show. Video example here and more info here.
Note: Business name and ABN are needed to access Amazon Business for those who want to sign up