Can anyone tell me if there are any exchange goods websites?

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Hey people, i have been searching the net for quite sometime but am unable to find any website where I can exchange my printer, and buy a better one. Does anyone know if such sites exist?Please do let me know what they are?I do not want to buy a new one,without selling the old on.e Simply it will take up space. So if any of you people know where I can exchange stuff, for new one's please do let me know