South West grower and market agent Paul Da Silva, from Grower Connect, said the wholesale price had fallen 50 to 70 per cent, compared with a week ago, even though WA had not imported strawberries from Queensland for a decade.
Sewing needles and pins have been deliberately placed inside strawberries across the ditch.
Three more punnets were found contaminated with needles on Friday, according to ABC Australia.
Fruit sold under Berry Obsession, Berry Licious and Donnybrook brands have been affected, while New South Wales police warn fruit sold under the Love Berry, Delightful Strawberries and Oasis brands were inserted with needles by a possible copycat.
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Health officials in Australia are warning citizens to cut up strawberries before eating them after people reported finding needles inside the berries.
"Coles has complied with Queensland Health's request to remove Donnybrook strawberries from sale following reports of product contamination", the statement said.
Young advised residents that all strawberries, regardless of brand, should be cut before they're eaten. A number of grocers have removed the berries from their shelves.
On Thursday, the Queensland Strawberry Growers Association said it had "reason to suspect" a former employee was responsible but police are still investigating. "It is a very, very broad picture and we can't speculate in any way, shape or form", said Terry Lawrence, Queensland acting chief superintendent.
Queensland Premier Annastacia Palaszczuk told media on Saturday investigators were doing "everything they possibly can" to find those responsible for the tampering, and pleaded with the public to come forward if they knew any information.