Our Pinballpro pinsound kits are only $100 http://pinballpro.net/product-category/all-products/pinsound/
Unfortunately the post office is who is off the charts, changing $94.30 that's actual cost for Priority Mail. I wish they were less. Australia is hands down the most expensive to ship to. You will however be very happy with the sound, we have many customers in Australia. Certainly buying multiple kits will show a savings for you as well.
Thanks
Greg M
Pinballpro.com