Always check your till receipt in the supermarkets when these offers are on.My friend Carol was in Tansaş the other day and 2 of the items she bought,on offer,were charged at the normal price.Fortunately she noticed this when she was leaving and told the cashier.She managed to get her money back but not till after she'd filled in forms etc.It didnt help though when one of the cashiers remarked 'Its only 2tl!' (in Turkish).What she didnt know was Carol can speak Turkish.2tl is 2tl and when an item is on offer it should be charged at the offer price.