I have several of these available. Each is clean, guaranteed to be working flawlessly, and includes the system, AC adaptor, an original NEC controller and three random HuCards (they won't all suck, I promise).
Because of the age of this system I cannot guarantee they'll be free from discoloration. Almost all PC Engine systems turn a bit yellow. Most can be resolved by a long soak in some mild bleach, but because it's a time consuming process I won't be doing it for you.