Walmarts?

I went to the hospital with my sister yesterday because she's pregnant and due any day now. As I was sitting in the waiting room I noticed this older woman in her pajamas and slippers talking to another woman about her grandson that was just born. Her country accent was driving me crazy. I could hardly understand what she was saying. When my sister came in the room to get me she noticed the woman in pajamas also and told her she liked her slippers. The woman responded with "Thanks! I got them at that there Walmarts!" What is a Walmarts? People are hilarious.