I have bought Now Natural Foods brand powdered whole milk at local health food stores. It's "non-instant", but you just have to stir it a little more. Carb count is 11 g per 1/4 cup dry, which makes 8 oz. milk.

Their website is http://www.nowfoods.com - they don't sell it online, but they offer a store finder based on zip codes for their products.

Good luck.

Milhafre