Wondering about clothes prices

السلام عليكم I am wondering about original clothes prices like between the price here and in the europe like for example birkenstock sandals here in algeria in the trusty stores which are common that sells only originals so i found that birkenstock arizona's price is 12000-14500 da in the other side its costs like in france something like 120 euro and i found another store like doing a discount it costs 90 euro which means at max 25000 da So any explanation and thanks Btw sorry for the english i am like begginer and i am trying to practice it .