I've left stuff in my cart for a few days and saw the price move somewhat. One item went up, the other down. I just assumed that they use some sort of algorithm that automatically bumps prices up and down periodically based upon their inventory and sales volume for each item. It was funny, because I hadn't realized that I left the item that went up in price in the cart and went back to the site to buy it, and when I saw that the price went up (don't remember how much, but it was only a couple of bucks on a seventy dollar item) it made me decide not to buy it again. It just struck me as odd that a "clearance" item would go up in price at all. even if it was just 3%. Doesn't bother me that they do it, but sometimes I wonder if humans and computers are working together or independently.