I have purchased one of each and hope they aren't disgusting.
According to BWS website: Offer valid Wednesday 9th September 2020 to Tuesday 3rd November 2020. Mix and match on any seltzer singles, excluding seltzer multipacks. At this great price no further discounts apply. Limit of 1 redemption per customer, per day.
I feel they really dropped the ball with these in Australia. It's a massive market in the US, but the offerings so far have missed the point of what made it a big thing in the US: Massive cheap can of high percentage alcohol without the huge amounts of sugar these types of drinks usually have.
Instead, in Oz they've launched these piddly cans and most are less than 5% and the same price as regular premixes, even though its effectively mostly water. Might as well neck a $5 bottle of sparkling, not many more carbs.