Condenser may be worth something. I think the term accumulator is used with systems that are controlled by orifice; filter/drier or receiver/drier is used to describe those controlled by expansion valve. Either way, they are not re-usable. Once you take them off and expose them to the elements, the desiccant (removes water vapor from the freon) in them is useless. Most a/c experts would recommend changing them on a periodic basis anyhow to re-new the desiccant, and to keep the desiccant from breaking down/loose and clogging other parts of the sytem -- especially the expansion valve or orifice. No one that knows how they work would buy a used one. No one with scruples would try to sell a used one.