In New Prague, Minn., population around 7,600, Kendra and Paul Rasmusson [opened a grocery] store that is largely unstaffed. The couple's young daughter has epilepsy, and they discovered early on that a healthy diet could help her feel better. They couldn't find enough local, organic items at the big-box store close to town. So ... they opened Farmhouse Market. The numbers wouldn't work if they were to run it in a traditional way. Inspired by a nearby 24-hour fitness center, they had an idea: Why not create a store that didn't need staff, for shoppers who wanted organic [food] from local farmers? Members pay $99 a year and use a key card to open the door. They can shop anytime they want. Local farmers, beekeepers and other suppliers have cards, too, so they can restock their supplies at midnight if they want. In Baltimore, the Salvation Army market is tackling an urban version of the grocery-store drought. The DMG Foods was built in the front of a Salvation Army distribution center in a neighborhood where families in public housing mix with Johns Hopkins students and older people who grew up there. The cheery store, whose name is an abbreviation of the organization's motto, Doing the Most Good, feels a little bit like what Amazon would ship if you typed grocery store" into the search bar. And in a way, that's what [founder Maj. Gene]. Hogg did. "We didn't do this to make money selling groceries," Mr. Hogg said. "We did this so people could have a neighborhood grocery store with fresh food."