You may be aware that we used to host the NZ CentOS Mirror ftp.wicks.co.nz. This server is no longer in our network and is now not considered local / non rated traffic.
The good news is that we have setup our own linux mirror - which can be found at mirror.xnet.co.nz - it is available over IPv4 and IPv6, either HTTP or FTP, and is unmetered.
We are slowly building the content available on it, but as of writing this post - it currently has the following;
Ubuntu (iso's only at this stage)