In my search for chickpea flour, I came across a website that might be helpful for you as well.
Gluten-Free Pantry
www.glutenfree.com
I requested a catalog and they seem very aware of the needs of people with autism, celiac, allergies, and even those with certain blood types.
They offer flours, breads, mixes, cookies, snacks, vitamins, pasta, cookbooks, and also helpful resources.
Hope this helps! Now you can cook for them when they visit!!
~~Shimmer~~