Where can I buy milk powder in the Bay Area?
Rainbow Grocery bulk section.
Ruth reported four brands at Milan a couple of years ago. They have the widest selection of Indian spices etc. I've found. http://chowhound.chow.com/topics/675652
If it's made in New Zealand, they might have it at Mangals.
990 University Ave, Berkeley, CA 94710
1699 E 14th St, San Leandro, CA
I went looking for powdered milk made from whole milk (aka whole milk powder) a couple of years ago. Most powdered milk is nonfat, because the fat makes it spoil more easily. I found the whole milk versions at Indian markets -- there are several brands, mostly made in New Zealand for the Indian market.