The holding of funds, documents, securities, and other property by an impartial third party for the other two participants in a business transaction. When the transaction is completed, the escrow agent releases the entrusted property.
Just google "escrow" and you will find New Zealand based companies.
As an example, SafeKiwi Escrow is one such service headed up by the ASB Bank and here is why we recommend them:
Nameboy.co.nz recommend that you consider the use of escrow services for your trades - if you want to know more you can check out Safe Kiwi here