GrabOne is offering half price delivery savers (3 month and 6 month options).
It seems like you are buying a promo code through GrabOne, and then buying the actual Delivery Saver plan direct from Countdown but "paying" for it using the promo code purchased at GrabOne.
Options:
Delivery Saver entitles you to unlimited free deliveries on orders over $80. Otherwise, it is $12 for orders up to $199.99 and $8 for orders over $200.
To activate your Delivery Saver, shop online at countdown.co.nz and add the relevant Delivery Saver product to your cart when you place your first order, then enter the GrabOne voucher code at checkout. Valid for Auckland customers only. 3 month Delivery Saver is valid for 3 months from date of first order. 6 month Delivery Saver is valid for 6 months from date of first order. Only available for delivery of online purchases and use in full service areas (excluding Great Barrier Island, Chatham Islands, NZ Post Rural Delivery areas - find out if your address is rural here: https://www.nzpost.co.nz/tools/address-postcode-finder). $80 minimum spend per order applies. Orders under this value will be charged the standard fees as applicable. Voucher expires 31 December 2018. Maximum of two active passes against an account at any one time. Tobacco, stamps and gift card purchases are not included in discountable spend for coupon or delivery fee discounts. Visit shop.countdown.co.nz/shop/content/delivery-saver for frequently asked questions about Countdown Delivery Saver. No refunds unless required by law. No cashback.