Hi, where do you live? USA or Canada? In Canada we have a store called Bulk Barn. It sells food in bulk (in bins) and you just put however much you want in plastic bags. Bulk Barn has soy flower.

You could also try any other type of store that sells food in bulk like this or even some health food stores that sell food. I don't think GNC (General Nutrition Centre) sells food, only supplements, etc.

There is a great recipe for LC bread that I used to make. It's a bit of work but the taste is better than any of the others (IMHO). If you need the link to the recipe let me know.

Hope this helps.