The fans of the Z are made by Spal. They are a standard 125mm pull fan. There are lots available on ebay for about a quarter of the Yamaha price. However, the question is finding one that has the right cowling mounting points for the Z's radiator, most have four point fixing.

You could strip and use the motor off an ebay one and fit to the existing cowling, or perhaps make a more common 4 point fixing version fit without to much hassle.

Here's an example of a 100mm one that came up in a quick web search: http://www.ebay.com/itm/SPAL-4-Paddl...30df75&vxp=mtr

Anyway, have a search around for Spal fans (used and new) in Australia. I'm sure you'll turn up something...

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