If it is unavailable for the delivery to ACT, I don't think there is a lot that you can do. I am yet to try to redirect DM deliveries using Australia Post My Post app to circumvent big price discrepancies and availabilities between different states/postcodes.
In my case, it was available for the delivery to my address. It was showing up as a "Member offer" at $62.90. Yet it was showing at $14.88 for the delivery to East Brighton Vic (credit to @
kevviek ). DM themselves said that is incorrect and the price for the delivery should be the same Au wide.
As how good is this wine - hopefully I will get it next week and will try it and let your know. I have had it before and vaguely recall that it was very good.