There are plenty of good cars for sale after perusing drive, trading post, drive, carsales, carsguide and also carpoint (thats got most ). There are a lot of cars so you can take your time to get the features and colour you desire.
However please ensure that you get the car checked out by a professional who knows the car. ie, an Alfa workshop. For a $100-150 its money well spent on any car - any make, any model. You pay, you get the report and the correct 'facts'. An independant assessment is a good investment, and not a shoddy buy.
Never used ebay so I can not work out the auction with independant assessment thing i...

Check out the Qld club website for contacts for alfa workshops and or dealers.
Best of luck.