I want to buy vital wheat gluten for bread baking but I've only had luck finding it at health food stores where it's quite expensive. I know seitan is made from vital wheat gluten so I was wondering if the powder is something that is commonly found at Asian groceries? If so, what would be the name for it?
Some Asian stores do carry it as it is used to make seitan. However, there isn't a blanket yes or no answer as it is up to the individual stores. The only thing you can do is to check the stores you can get to.
It may also be called gluten flour but, if you see this, be sure to read the label to ensure that it has 75% or more protein.