You will receive a free scoop in a cup when registering your details on Club Natural. For new and existing members, who have not registered their details yet. Valid until 31 January 2020.
You need to go to a store to get a membership card. Then register online.
Link to sign up: https://www.newzealandnatural.com/club-natural
The link on their own website to the free scoop post on instagram is broken, the correct one is https://www.instagram.com/p/B6jaYLNBSyx. Makes me feel they have no comunication at all and very likely no shop will be aware of this promotion.
Anyway, quite elaborate, you need to go into one of their shops, get the card, then register it on their website and then go back for the free scoop I presume.
https://www.newzealandnatural.com/club-natural
Register your card
Grab your card from your nearest parlour, register it below and start earning. For every dollar you spend in parlour you’ll get 10 cents added to your card. Save it up or take it off your next order!
I confirm that this works in Mission Bay (Auckland) and Skycity (Auckland) stores.
Tried this at the botany store just now but they weren't aware of the promotion.