movieguru

Why do Amazon UK's prices on dvd's have absurd price flucuations? I have a number of items in my cart that I buy or intend to buy and every time I go into my cart many of the prices have changed. Not just little changes but 300% overnight. There was one dvd in my cart yesterday that was 4.97 (pounds) and is now 17.97 (pounds). Others have huge drops in price to. The same dvd can also change in price daily. I've never noticed this on the U.S. site; at least not to this extent.