Saw this today at Yogijis in Mount Roskill, Auckland. Supermarkets have the same 2L Anchor Milk for $5.20 usually so bargain if buying two. Applies to all colours (Lite, Blue, silver).
I bet it's a loss leader for them, but tack on a few of those fresh samosas and Indian snacks and it's still a deal for both sides.
Can also pair with the $5 AMEX Shop Small offer.
I can't see this on the Amex map. Have you tried it and got $5 back already?