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Many things from Japan are cheap now due to good exchange rate. A$1=100yen now. I compared Apple store Australia and Japan and found Japan is much cheaper than Australia. In Japan, online discount shops sell cheaper than Apple shop, but many shops don't have English webpage. Some of the cheapest online shops only accept bank transfer payment or cash on delivery payment. I found an online shop sells Mac mini, iMac at a good price and accept credit card payment. They have (half?) English webpage too.
EDIT: To change the language to English, click the dropdown list "日本語▼" at top right side. Then, choose "English".
[APPLE]Mac mini 500GB MC816J/A [2500] Core i5, Memory 4GB, HDD 500GB 45,480yen(A$455) ($699 Apple Aust)
http://list.qoo10.jp/item/APPLE-MAC-MINI-500GB-MC816J-A-2500…
[APPLE]Mac mini 1TB MD388J/A [2300] Core i7 2.3GHz, Memory 4GB, HDD 1TB 58,000yen (A$580) ($899 Apple Aust)
http://list.qoo10.jp/item/APPLE-MAC-MINI-1TB-MD388J-A-2300/4…
APPLE iMac MD093J/A [2700] 21.5inch, core i5, 8GB, 1TB 85,700yen (A$857) ($1429 Apple Aust)
http://list.qoo10.jp/item/APPLE-IMAC-MD093J-A-2700/409290776
It comes with Japanese keyboard, so you will have to replace it with English one.
They sell laptops too. I don't recommend them, as these comes with Japanese keyboard. Laptop keyboard cannot be changed easily.
They don't ship outside Japan, so you will need to use forwarding a company like tenso.com.
http://www.tenso.com/en/
iMac itslef is 5.68kg according to Apple webpage. you need to add weigh for keyboard, mouse and box. I would think it will be about 10kg when packaged. 10kg of postage costs 15980yen. It is still good value compared to Apple Aust! The postage would certainly cheaper if it's mac mini.
I am still thinking about which one to get, but I think it's a bargain.
what about warranty ? is it still valid in Australia ?