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File photo / NZ Herald. The cost of postage is set to rise in July, New Zealand Post says. The standard letter rate, which is the cost of sending a medium-sized letter by standard post in New Zealand, is set to increase from 70 cents to 80 cents.Sending larger letters would also cost more, increasing from $1.40 to $1.60.epending on the size of the parcel and whether it was self-wrapped or in a New Zealand Post postage bag, people would be paying between 10 cents and $1 more. Meanwhile, premium letter services, which is Fast Post and Box Link, would not change in cost, New Zealand Post said.
How much postage do you need to mail a letter from US to Canada? As of 2013, it costs $1.10 to mail a letter (up to 1 ounce, or  about 28 g) to Canada from the US.    Rates differ depending on the size of mail and other mailing  op â¦ tions.