Looking at the same single 13mm button on AliExpress from New Zealand, I also get the free shipping offer, 15-34 days via China Post Air Mail (I can also choose

Looking at the same single 13mm button on AliExpress from New Zealand, I also get the free shipping offer, 15-34 days via China Post Air Mail (I can also choose the DHL Express 3-6 day shipping for a mere $157.45 USD!) I've noticed how common free shipping on AliExpress is and wondered the same thing as OP. Typically shipping to New Zealand is very costly due to remoteness. We do have a free trade agreement with China, not sure that would make a difference.