According to an article today in the Sydney Morning Herald, the domain name InvestmentProperty.com.au was sold in an expired domain name auction for $125,000 (around $129,000USD). The auction was held on NetFleet, a domain name aftermarket and sales venue.
The report states that the buyer is an Australian property developer, and apparently the previous registrant did not realize the domain name had expired.
The sale of InvestmentProperty.com.au is reportedly the highest publicly reported .com.au price achieved, significantly higher than the previous high of $33,000 for Hardware.com.au. The article does cite other private sales that may have been higher, including Poker.com.au, Flowers.com.au, and CreditCards.com.au.