Tradingpost has 0 Proton cars for sale under $5,000 in Mount Kuring-gai, 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 Proton motor vehicle always be sure to check out the wide range listed on Tradingpost!