Bubbles, you will probably need to go to a health food type of store to find these items. Oat flour, I'm pretty sure, you can get from putting oatmeal into a food processor and blending it down until it's in a flower form.
Most Kroger stores now have a health (or healthier) food section. Look in that area for the rice and oat flower. Bob's Red Mill brand is usually sold in small packages.
Hi Bubbles! I'm so happy you are a member of my Home Cooked group! Very cool!
Yes, in NYC, we have plenty of stores here but only select health and more upscale stores sell them. For a chain store, we found them at Wholefoods. We also find them and the carob powder at health food stores as well. Good luck!