Barley should be near the split peas or lentils or bags of beans/legumes. Bulghur, I get mine at the health food store, its cheaper than the grocery store but that should be in the baking aisle. Look for Bob’s Red Mill. Little bags, usually by the fancy flours like spelt, potato starch, potato flour, gluten etc.
We found some variety of barley but it was not the pearl barley specified in the recipe. If the flour is a health food store item, that explains why I have never heard of it. I have never been in a health food store.