Problems with Milk

I have been having problems with milk. I always seem to have either too little or too much. It's so expensive to buy milk in containers less than a half gallon, but I never seem to use it fast enough. Then when I'm cooking and need milk for macoroni and cheese, Hamburger Helper, or a host of other needs, my milk is bad.

For the past few months, I've been purchasing powdered milk to have around to rehydrate as needed. Has anyone used it much? I find it quite handy to have around for cooking when milk is needed. It doesn't really solve the problem of having no milk for morning cereal though.

Does anyone else have a similar dairy problem? How have you gotten around it?