Taken from whirlpool from here and modified slightly http://forums.whirlpool.net.au/forum-replies.cfm?t=1441298&p...
Basically the "free shipping worldwide" policy at book depository isn't 100% true. If you visit the site from a UK address, the total price including shipping is cheaper than if you visit it from Australia.
Method (from WP post):
Install the edit cookies plugin for Firefox from here: https://addons.mozilla.org/en-US/firefox/addon/4510
Then use the lunchbrowse.com to access http://www.bookdepository.co.uk/fccbookclub (most web based proxies will do). Use this address to make sure that the coupon code box appears at the checkout later. I added a book to my basket at this point.
Then go to cookie editor – search for lunchbrowse.com. Click the c[bookdepository.co.uk][/][ENTITY_SESS_ID_UK] and copy the content bit which will be something like: lngmess7j75vji24rlvva8imv5 (do not use this one!)
Then search for bookdepository.co.uk in the edit cookies section. Edit the entity sess id and paste in that one you used.
Then access the site bookdepository.co.uk in your browser and you should have whatever you added to the basket and have UK prices as well. Change the currency to AUD at the top right.
When you are ready, go to your basket and add the coupon code FCC221 for another 10% off.
As an example, I was able to get "the rough guide to thailand" for $13.69 delivered. This compares to $23.27 without the 10% off and this hack from book depository, or $19.50 which was the cheapest price on booko (abebooks), or 39.95 from dymocks in store.
One word of caution: don't buy through the proxy. It will probably work but is asking for trouble. Use the technique above to avoid entering in confidential information (paypal account) on a proxied page.
Mod: Put back original description for clarity
Mod: Further discussion here