Got presents to send to family in Wellington area (various sizes 4 no. Could combine all in one bigger box). Is NZ post the best option or are there other more economical alternatives?
Check out TradeMe's shipping rates --- you don't need to be selling something on TradeMe to use it: https://www.trademe.co.nz/MyTradeMe/Shipping/TradeMeShipping.aspx
I find it's cheaper than the post office a lot of the time, and they even pick the package up for you.
Trademe as backfiah mentioned, or Pass The Parcel.