Some also sell aspirin, antacid, Halls sore throat lozenges, toilet paper, bottled-water, bar soap, shampoo, t-shirts, cigarettes, condoms, also dixie-cups, soup, powdered coffee creamer, pop, milk, potted meat, bread etc, ETC. Not the same level of a grocery store of course, and usually at a VERY high markup.
But still it IS double edged sword as to rather or not they are necessary!