Not sure what the ozzie dollar is these days, but reckon pretty close to the US dollar these days (you've got the commodities, and US gots the deficits).
Now to your questions - a new 911 Turbo over here is around AED 450k starting price - thats about $130k USD. A 3 year old Turbo can drop upto half the price in a bad market. Remember there are not that many buyers for this breed of the car. However, dealers will sniff out any of these that are in good condition, and they see an arbitration to make money on.
So, answering your question, yes, its probably possible to find one in the price you mentioned, but you better double/triple-check what you're buying as well - you could get stuck with a lemon.
Also, don't you drive on the other side over there? These vehicles are NOT to be converted!