I think USD means United states Dollar(s). Depending on your country and the type of currency ( pound, pesos,ruble) then the rate of exchange may increse the price. For example if I buy from a seller in Great Brtian and his fixed amount for the item then I would have to find the amout of exchange ( only an example 20.00 USD = 28.00 British pounds) i don't know your situation but it sounds as if the rate may have gone up it does go up or down. I hope this helped
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