this would be the #1 place I would buy a used system. from what I recall, they guarantee working and can plug it in before your buy. cost varies depending on console condition, accessories, with/without box and controllers. plan on $65-125.
They are used. It is almost impossible to find a brand new 64, they have them online but they will cost you an arm and a leg. I have bought stuff from this store and they have awesome quality. Their console come with system, controller and cords needed to work. I recommend them
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