Walmart is linking up with Roku to release a full-length Christmas movie that will let viewers buy products on their TV during specific parts of the story, Business Insider reports . It’s the retailer’s second go at the idea of shoppable TV after previously trying out a social media romcom series. Walmart learned customers seemed likelier to buy something the longer they watched, so a feature was the next move. This time Walmart will make it easier to buy products on the TV screen by enabling