Customers claim their shopping bills are costing them even more at the till as supermarkets are accused of failing to keep up with price rises.
Shoppers have reported seeing one price on the shelf, but then paying another at the checkout because of a delay in updating labels.
Raising the issue on the Reduce Your Supermarket Spend Facebook page, one shopper said: "Has anyone else noticed the supermarkets are not keeping up with replacing the prices given on the shelf for items and then when you go through checkout it puts another price on.