Both Madrolla and myself paid $250 for ours from a commercial wreckers in Perth. This included inlet and ex manifolds, injectors and fuel rail, some wiring etc.
However there was one that sold on ebay only a couple of weeks ago for the $125 STARTING BID!!!!!!
Oh and for what you can pay for an aftermarket ECU these days I personally think you'd be stupid to run a stock ECU. :P
This is pretty cheap....
http://cgi.ebay.com.au/microtech-LT8-ecu_W...=item1c0e5b73de