You purchase toilet paper, computers and paper towels through the Amazon website. Now, you can buy your next house. The world’s largest retailer is partnering with Realogy, the largest U.S. residential brokerage, to match homebuyers with real estate agents through a program called TurnKey. In return, customers get up to $5,000 of Amazon products and services. And, yes, that includes Alexa-enabled smart home devices.