You could can it:
Canning Milk
I think you would have to get a pressure canner, instead of boiling them. If you just boiled it, it says the milk will turn brown and carmelize.
From all of your frugal questions and your desire for high quality food, I think you should learn how to can. You can make everything from scratch, not take up too much space in your freezer or refrigerator, and in the long run, I think the pressure canner would pay for itself.