Seems decent considering the fact that a normal 200 pack is around $10-$12 from PNS, New World, Woolworths.
It's the Lumiere Double Wall Tea Glass (220ml) currently sold for $12.95 on the Dilmah website.
Officially it's instore only, so it's hard to know if it's at every store or a selected few, but it is also available online from the following stores (Grocer):
Featherston, Green Island, Greytown, Half Moon Bay, Leeston, Mangere Bridge, Nelson City, Renwick, Woburn.
It's sad that the 100 pack from The Warehouse is no longer $3.