I have a friend with a child who is allergic to a number of things (wheat, peanuts, etc.) and she sometimes has trouble finding the gluten-free products for her son. As previously mentioned, MegaMart is usually where you will have the best chance of finding these items, but stock up if you find something that you need (as opposed to something you want or prefer), because you may not find it the next time you are at the store. Sometimes you can ask the store to order items for you, especially if you are willing to buy a number of boxes/packages of a particular item.