At small-town supermarkets in Western Australia's far north, a quarter of a watermelon could set you back $18, and you may pay up to $30 for a kilogram of truss tomatoes.

In Sydney or Melbourne supermarkets, you would pay around half that price for watermelon, and three times less for the tomatoes.

Perth-based First Nations advocate Megan Krakouer visited a supermarket in Halls Creek in August and said some of the prices were "astronomical" — including tomatoes priced at $11.99 per kilogram and watermelon at $6 per kilogram.

"We're living in a cost-of-living crisis — how are people supposed to be able to feed their families healthily with prices like this?"

she said.

Almost 300 kilometres away in Fitzroy Crossing, red gala apples were priced at $12.99 per kilogram and pears at $10.99

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