No coupon necessary. Wanted to buy a few kombucha bottles for my partner, so not having a minimum spend requirement is great. Not sure when it ends.
They also have some deals on their Sparkling Water machines, but these seem to be at a similar price in other retailers.
FWIW Woolworths just raised their price for soda water from 75c to $1.10 for their 1.25L bottles. Previously it was kinda marginal as to whether it was worth having a soda maker, now it is a dead-set win.