Walmart is selling a tiny one for $15,900 that it will ship. The U.S.’s biggest retailer is selling 19-by-20-foot homes that have space for bedroom, living room, dining room and kitchen areas.

You can buy clothing and household supplies on Amazon — but what about an actual home to keep them all in? Now, shoppers can find something unusual on the app: a $19,000 tiny house for sale ...