Every little bit helps?

 I have noticed recently that you have to be really careful in the supermarket when buying two for one offers.

This morning in Tescos Copella 75g bottles of juice were £1.45 or 2 for £3.00.  This isn't the first time that I have noticed this sort of discrepancy.  Of course it could have been a mistake, but it pays to be alert so as not to pay over the odds!