Food Allergy Awareness Week

This is food allergy awareness week, although I have only seen it advertised in one place, so I'm not sure what the scope and purpose of it is. Since being diagnosed with food allergies three months ago, I have fluctuated between trying to avoid major offenders, and then getting so discouraged (and hungry!) that I just throw the diet out the window.

I finally made some time today to go through a library cookbook that amazingly avoids all six foods I am allergic to, and figure out what I can eat that will satisfy my taste buds, my hunger, and my intenstinal lining at the same time. I made a list of ingredients that I need to buy, and I have absolutely no idea which store to find them in, or in what part of the store they would be located:

oat flour
rice flour
chickpea flour
tapioca starch flour
quinoa flour
barley flour
rye flour
xanthan gum
agave nectar
coconut milk
maple sugar
unbuffered Vitamin C crystals
walnut oil

My first thought would be Whole Foods or Central Market, but unfortunately, those are both a 30-45-minute drive one way, which I would prefer not to make if at all possible. Of course, if I can manage to only go every several weeks, it would not be that bad. Has anyone seen any of these at someplace like Kroger's? You would think that grocery stores would be eager to attract people who have no choice but to buy these expensive substitutes for wheat and sugar and milk, but every time I have tried to look for anything out of the ordinary, I have the hardest time finding anything, and just give up. Any help is appreciated!