Have a look around other forums
You can pick good cameras up from cloudynights, ebay, astromart and astrobuysell.com easily, just ask about shipping to Aussie or wherever you are (mentioning at your cost has always swung it for me).
$100 is maybe pushing it but I struck lucky in NZ by finding a SPC900NC from a "normal" who happened to be having a clear out of his garage. $NZ45
Hunt around but I have always found brand new CCD cameras to be way over priced..generally.
Stu