IMO in Melbourne there must be a store or two selling second hand cameras.
Sadly you can't hope to find a 30D for a bargain yet
But I am sure you can find some 350D for 500-700 depending on the conditions. if well kept, the 350D is still a great buy and IMO the extra money to get a 400D isn't really worth if it wasn't for the fact we are talking about new vs second hand