The recent $10 deal expired (https://www.cheapies.nz/node/28612) so I tried a variation of the coupon code using 10OFF2021 and it was applied.
I am assuming the Ts and Cs would be the same? "Can be used once online and can't be used in conjunction with any other coupon. Limit of one voucher per person. Can't be redeemed on shipping or 1-day bottle."
Hope this helps someone. Happy shopping!