Not quite as cheap as the NL offer the other day but still a decent price for Twinkly's.
Harvey Norman Northwood had stock on hand when I visited at lunch time today. Website mentions online orders are for delivery only.
May not be eligible for Price Guarantee at Mitre 10 (if they try to use their 'stock liquidations' clause) but worth a shot.
3 left in stock of the 400 pack at Harvey Norman Wairau Park. Plenty of the 250 packs.