In case you thought those Amazon Dash buttons would turn out to be an elaborate joke, Amazon has made them officially official: any Prime subscriber can now buy them for $5, and once the button arrives they can then use it to spend more money on whatever the related product is. So, essentially, you’ll pay money for this so that you can more easily spend money later. Or something like that. The buttons are available for a variety of products: toilet paper, laundry detergent, macaronic and cheese. The important things in life.