The price of USB flash drives is reviewed and updated every week. In fact, the price varies according to the market price of the memory chip. The market considers chips to be a commodity, such as oil and precious metals and, as for other trade goods, prices fluctuate according to various factors. This influences, yet only slightly, the cost of USB flash drives and thus the price at which they are sold on the market. This is why we update the price of our flash drives weekly, and you may notice slight differences from one price list to another or from one quote to another. According to this principle, the other products in the catalogue are also subject to slight changes in price, but these are much more stable costs influenced mostly by the currency exchange.