Hello, Prices are based on supply and demand, but also depend on suppliers and the availability of goods. Prices can also fluctuate on a daily basis, which is why a 'Price evolution' tool is available on the page of each item so that you can get a better idea of these fluctuations over the last few months. And if you add an item to a wish list, you'll automatically receive a notification if the price drops. Finally, and in this case, it seems that we obtain these different models/sizes from different suppliers at more or less advantageous rates, which is reflected in our own prices.