I checked online real estate; the cheapest land I saw was $45,000 for 2 acres - with services available, but not connected, and with road access. I expect an unserviced, with no road, on the "edge of wilderness" bush block would be cheaper, esp if a private sale and if not online. I've tried looking in the past, with no luck; don't know how to find out about it.

Another conversion:

    5 acres = 20,234 m^s