If you are doing any last-minute holiday shopping today, beware of bargaining employees, this story in The New York Times says. As shoppers have figured out how to use smartphones to find the best deals, some retailers have begun training their employees on the art of bargaining with customers. Best Buy Co. Inc., for instance, announced that it would match the prices of any competitor if customers showed proof of lower prices. Others are doing the same thing with less publicity. DealScience, a website that collects, compares and ranks deals from thousands of brands, discovered that at least 20 percent of big-box retailers have price-matching policies.