This is a lovely topic. Thought I would revive it.
This happened six or seven years ago when I worked in Poundland (a shop that sells items for £1 each) over the Christmas period.
One, extremely busy day a customer comes to my checkout and is wanting to buy some Christmas plates. She only has one so I tell her "you can get three for £1. Would you like me to get somebody to bring you some more?" She replies yes and so I ring for someone. Now she has been waiting a good ten minutes at this point and not once complained. I don't work in retail now but I have also worked in Primark in the past and she is one of the nicest, understanding customers I had.
This Easter my brother (28) bought my sister (29) an Easter egg because she didn't have one
Today: I bought some books