With fewer than a dozen days left in the holiday shopping season this year, it's as good a time as any to take a look at some pricing trends. The Wall Street Journal has an interesting Christmas Sales tracker comparing prices at different retailers over time for bigger-ticket Christmas gifts like a KitchenAid Mixer, Keurig coffee machine or 55-inch Vizio television. But let's glance at some less common gifts: the items in "The Twelve Days of Christmas."