Go to Pier St, Altona. There are many real estate agents there and they do Altona Meadows and Laverton. Tell them what you want and ask them to put you on their mailing lists whenever a new listing comes up.
The REIV median house price for Altona, Altona North, Altona Meadows & Williamstown are currently 668K, 501K, 400K & 800K respectively. So the price increases by more than 100% in 10 years.