Ever try to figure out if it’s more cost effective to buy the big can of coffee or the smaller one? Or the 20-pack of beverages instead of a 12-pack? Many consumers assume buying the larger package will cost less per item, but that’s not necessarily the case. To help consumers make that determination without having to pull out a calculator, stores are required to post what’s known as the “unit price” for regulated products. Those units of measure, such as ounces, pounds, pints, 100-counts and so on, help shoppers figure out whether a larger or smaller package offers a better value. Walmart has…