It's been cheap like that for a while at that very store. Other IGAs don't seem to have it at that price.
614 Sydney Road, Brunswick, Victoria 3056
I can't compare it to other almond milks, but at that price it's delish with my cereal or as hot choc. Doesn't froth very well for coffee.
edit: Best before 31/10/2020. I bought 4 cartons, so they don't seem to limit this product.