I couldn't answer this question until I went and bought milk tonight. Milk is expensive around here. It's 1.90 for a quart of milk and between 5 and 6 dollars for a gallon. We never buy a gallon of milk though. It's just two of us, and we have trouble using all of the quart of milk before it goes bad. I don't drink milk though. I only use it in cooking. Oh, and we live in the midsouth region of America.
I thought it rather strange that milk was so expensive, but the general cost of living and other groceries are quite low. But milk has to be transported quite far to get here, across several states.