Specialty varieties like hulled barley or barley flakes are more likely to be found here.
This is the most common home for bagged grains like pearl barley.
You can find barley at most national and regional grocery chains. Availability often includes: where to buy barley in grocery store
In most grocery stores, barley is typically found in the alongside rice, oats, quinoa, and farro. Depending on the store's layout, it may also be stocked in the soup or bean aisle near dried lentils and peas. Where to Look in the Store
Look here if you are specifically searching for barley flour. Major Retailers Carrying Barley Specialty varieties like hulled barley or barley flakes
Often found in the lower shelves, barley is frequently grouped with dried soup mixes and legumes.
If you are having trouble spotting it, check these specific sections: Availability often includes: In most grocery stores, barley
What's the Difference Between Hulled and Pearl Barley? - The Kitchn