Store brand sales of food, beverage and non-food items have been relatively flat the past year, according to Chicago-based market research firm IRI, which reports that dollar sales of private brands at supermarkets and other food retailers inched up .6 percent with unit sales up .9 percent compared to the previous year. So there is something to be said for the 2017 Store Brands’ Growth 100 list, featuring data compiled by IRI highlighting categories where private brands posted dollar and unit sales gains of 5 percent or more and accounted for $5 million or more in total sales in the last year.