Sainsburys normal 3 packs of beer for £20 offer, EXPIRES: 01/06/2010
But this is what happen last night, I bought 1 pack of Grolsch 15x275ml and 2 pack of Carling 15x440ml, paid £20 and ready to go home, but my mate change his mind after he spot the Fosters 15x440ml also in the offer. So we went to the customer service to exchange the 2 Carling for 2 Foster's, should be straightforward. After she scan those packs for refund and purchase . To my surprise the till display -£16. (Mean give me £16 back?) Obviously the shop girl knows it cant be right. She try to scan it again,still not bring to £0. But at the end she cancel the whole order and takeout £20 for refund and scan it from fresh start.
Hope it would work for some one.