Everyone who's interested knows that Sainsburys selling Kopparberg Pear Cider 4 x 500ml cans for £4.49 at the moment, but...I managed to but them twice for £1.45!!!
The do this you need to turn the cans in a 4pack so only one can on each side shows full bar code (the other can shouldn't have bar code visible). Then try to pick cashier who scans items automatically, without consideration. Put the 4pack on the conveyor belt so the codes on the cans are on the cashier's and scanner's sides (the code on the paper packaging shouldn't be in the scanner range). Then hopefully cashier grabs it, scans the code on the can, making the sweet deal of 4 x 500ml cans at £1.45! I did it twice already
I hope it will work for you as well.