GNC and Walgreen's are the two largest vendors of food supplements. Trader Joe's and Henry's have their own in-store line of supplements and nutrition but do not have the same buying and selling power as larger stores.
You can find a store that sells pre-cut bell peppers in the produce section of most grocery stores or at specialty food markets.
You mean croutons? Most every grocery store sells them.
Lowe's
In America, over-the-counter (OTC) vitamins and mineral supplements can be purchsed in most grocery stores, drug stores, and dollar stores. Just watch your expiration dates!
Most health food stores stock Hawthorne or Hawthorne Berry supplements. Hawthorne supplements can also be purchased online.
Cops and Doughnuts
The United States sells the most burgers. America is obsessed with fast food.
You can find a store that sells fresh kiwi fruit at most grocery stores, supermarkets, or local fruit markets.
The Pro Source website sells a variety of health and fitness supplements. They carry most workout supplements found on the market at any given point and time.
The Gola USA store sells footwear, most notably athletic footwear. The store sells shoes for men, women, and children along with sports and athletic bags.
What I would most likely do is go to the closest store that sells both weapons and ammunition along with food and medical supplies, defend the building with your life.
staples sells smencils. most school stores have them too.