Tradingpost has 0 Audi S4 cars for sale under $5,000 in Doon Doon, NSW. As Australia's favourite way to buy and sell for over 50 years, Tradingpost is the trusted way to sell your current car, and find your next car at a great price! When looking to buy or sell a Audi S4 always be sure to check out the wide range listed on Tradingpost!