Tradingpost has 0 MG MG3 cars for sale under $5,000 in St Mary, QLD. 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 MG MG3 always be sure to check out the wide range listed on Tradingpost!