Amazon Australia has as their own domestic stock, the Studio Series Bumblebee with Charlie figurine for just $41 (down from $52)... much cheaper than the Toyworld price of $70.
They also have the 5th wave of Tiny Changers at a great price of just $4 each - I bought some of these expecting the 4th wave (as those are the photos they have used on the listing), but ended up with wave 5 instead. The original listing on Amazon America is for the 4th wave (for US$5 each, which is a lot more expensive) gives a redirection link to that $4 Australian listing that gives you wave 5, so if you want the two waves that haven't been found in a live store here yet, you can buy up a fair few from both sites and see if you get lucky. (I've bought 35 of wave 4 so far, and am still missing Megatron)