Plano, Texas — At Home Group Inc., The Home Décor Superstore, has opened its 200th store, in San Diego. This milestone comes after At Home’s recent expansion into California, where the home décor retailer currently operates two stores with the potential to grow to more than 80 stores. “We are thrilled to announce that we have expanded our footprint to 200 stores in 40 states. With our long term goal of opening more than 600 stores nationwide, we continue to be excited about the significant whitespace in front of us,” …