Hi Rob, I live in Sydney and I found the best price up in Queensland for the nitro TT bike, here:
http://ultrahobbies.com.au/store/cus...cat=260&page=1

Otherwise, the Italian bikes have to be imported or if you are lucky and daring, you could try ebay??

Worst case scenario, Tower Hobbies is the US are trustworthy.
Have a look in the rcgroups forum, big bike forum:

http://www.rcgroups.com/forums/index.php

C ya
Peter