Wow, 285 AUD is a high price for a standard CDTV.
In the UK its more like £50 ($100) for a standard unit, then it goes up a bit based on how much software and the like.
SCSI interfaces, external harddrives (something I still havent managed to get) and the CDTV monitor turn it into £150+ amounts rather quickly though.
Your setup looks rather standard so in the UK I would think £50 +P&P, dont know about the US though.