Korean supermarkets are very generous with extras.

Two extra packages of yogurt attached to a set of four. The price stays the same of course. It's not like they are giving out the ones that expire soon. I also got two bottles of orange juice cheap, too.

It's not just food, but other everyday products like shampoos and detergents, too. Two huge bottles of shampoo for the price of one, full size hair gel attached to a full size shampoo bottle, etc. I am always amazed at the big bonuses the stores give out.