BENTONVILLE, Ark. — Walmart’s Neighborhood Market concept finally is getting its due more than 12 years after the first unit opened in late 1998. Next year, the company expected to open between 30 and 40 small stores, the majority of which will be Neighborhood Market units, in addition to a handful of pilot stores measuring less than 30,000 sq. ft. that the company views as a potential growth vehicle for either urban or rural markets.