How Much is a decent VZ Calais in Melbourne ?

[Zedlen]

I'm interested in buying a VZ Calais. I live in the Western Suburbs, Melbourne. I've looked around but prices vary everywhere I look. I'd like to know the average for well maintained car. Any feed back would be appreciated. Cheers

[TMM]

for a tidy V6 under 100,000kms i wouldn't pay more then $20000.