Exclusive: Analysis shows in some cases the switch from promotional to full price happens almost simultaneously in Australia’s two biggest supermarkets

You’re looking to buy an electric toothbrush. You’re in Woolworths and you see one of the Oral-B kits advertised for sale at $99.50.

The product appears to be a half-price bargain, reduced from its usual price of $199, which also happens to be how much the same item costs at Coles.

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