The rising price of milk is a hot topic amongst frugal folk. Dawn at Frugal for Life and Amy at The Motherload both share advice about freezing milk for future use. I noticed that even Aldi's yogurt prices have risen, too.
I buy half gallons of milk during Kroger's 4/$5 sales. Once in a while, the manager will mark down those with today's sell-by date to 99 cents. That's $2 a gallon, or the price of Aldi powdered milk. Half-gallons are much easier to fit in the freezer above my refrigerator. If I don't have room, I immediately make homemade pudding pops or yogurt.