Daily deal at Pak'n Save Rangiora. The following 2L varieties are $2.89:
Original 2L(paknsave.co.nz)
Trim 2L(paknsave.co.nz)
Lite 2L(paknsave.co.nz)
Set your store to Rangiora to see the price.
Could price match in-store at The Warehouse (product link(thewarehouse.co.nz)) at the Service Desk (they no longer price match food online)