http://www.ozmodchips.com/
I might be late running into this site but if your in OZ and you want to mod your XBOX or Wii, DS, PSP...etc. then this is the place you go to get your hardware. You can either have them mod a console and ship it to you or you can buy the parts and try your hand at bricking your console yourself.
Im very impressed myself with amount of info available on the site..   its very clear and concise without giving too much away as a retailer.  ( they do need to earn their bread now dont they)
Now, OzModChips is a Melbourne based business that imports and sells modchips directly to the consumer and in bulk to businesses or at least thats what they say.
if anything this is a good place to start.