If I said the words "Christmas" and "truck," what would you think of? The Coca-Cola advert, possibly? Well, this holiday season Amazon hopes you'll think about its "Treasure Truck" instead. It's a big blue machine that will be touring London, Manchester and other parts of the UK. Inside are special deals that you can only buy through the Amazon app. Here's how it works: You text "truck" to 87377, then wait for a message detailing the day's "treasure." If you like it, you can buy it through the app (under Programs and Features, followed by Treasure Truck) and pick it up in town.