On the subject of the pricing algorithm, one thing that blew me away (and has made me a pretty loyal customer) was purchasing something in the morning, getting

On the subject of the pricing algorithm, one thing that blew me away (and has made me a pretty loyal customer) was purchasing something in the morning, getting an email in the afternoon saying the price had gone down, and finally one last email in the evening informing me that the difference has been refunded to my card. The price change added up to only 1 or 2 dollars, but from a customer service perspective, it was super classy. I'm yet to see any other company do this.