Tony Hwang wrote:

> Just buy Aluminum free baking power or yeast from a health food store.
> No messing around making your own.
>

I just buy Argo at Albertson's Supermarket. It's on the shelf right next to
the cornstarch

http://www.argostarch.com/products.html

Clabber Girl bought the Rumford label and it's aluminum free too but
slightly more expensive than Argo.

As for cream of tartar, I wouldn't call them health foods stores exactly,
but a couple of local markets have bulk spices that a much less expensive
than those little McCormick jars. Of course, they have bulk baking powder
too. And cornstarch.