My 2 1/2 year old son was on a highly restricted diet for quite a while due to a lowered immune system. We found the website http://www.ener-g.com/. Very helpful. A local market sold some products and we were able to get them. He is slowly getting better and is now allowed to eat gluten foods but still cannot have any egg products nor any corn. This include corn syrup which is in EVERYTHING!!! That is a whole other topic!!!!
Hope the website helps. Not sure if anyone has posted the website yet.
Sorry if I am repeating something.