This page has up-to-date gold and silver prices and charts from goldbroker.com. Though precious metals are usually represented in USD, NZD is obviously more useful in New Zealand. These prices will be converted from USD to NZD at bank mid-rates so will usually be lower than the actual spot rates offered in New Zealand.
Precious Metal Spot Prices – NZD
The ticker below has up-to-date gold and silver prices using the Gold Price plug-in for WordPress. These prices are easily readable and importable as text (so useful as a data import for Excel).