For anyone with access to Westpac rewards/offers via a credit card, I managed to get the S22 Ultra 256gb for $1499.
You will need to access the Samsung site via your Westpac online banking account link.
It shows as $1699 but gets a further $200 off once you add any accessory or wearable (similar to the EDU store). e.g. I added the clear case which after discount is only about $20.
You can stack any trade-ins etc, on top, as others have had success in doing so (trade in from the shopping cart after you've added the s22).
Note that with this deal you do not get any of the preorder gifts.
But if they're not important to you then it's a pretty good price for the new s22 Ultra + a case. Or, add whichever accessory you want from the pre-order deals and it'll still work out cheaper than paying retail (e.g. Buds 2 are $186 and you can choose your colour unlike the preorder deal).
128gb is $1371.65
512gb is $1626.65
1TB is $1881.65
using the same method as above.
Edit: Other users have reported that if you add Samsung Care to cart before using the BONUSCARE code, then it will stack.
Confirmed this worked for me as well