Comment by stevetron

In the US, the way milk is sold, is that larger amounts cost less. In other words, the 1/2-gallon container, buy two of those, and it costs significantly more than a single 1-gallon container. It gets even worse for quarts. But I seldom buy in the 1-gallon container as it will generally spoil before I've used it all, so there isn't any savings there for me.