Cheapest I found:
https://www.ebay.com.au/itm/GATES-KP...4383.l4275.c10
Shipping cost on many UK suppliers is a a flat $199 AUD. This one is supposedly $8.50, so I ordered that one.
Another one I looked at had a sensible shipping cost based on the weight of the consignment. They weigh it and email the cost of shipping before checkout.