Used computer games

Does anyone know of a store in Taipei that sells used computer games? I am looking for a place where I can purchase used games, and I also want to sell some of the games from my collection that I have completed.
Is there such a place? If not, then I may have to seriously consider opening up such an establishment.

there are plenty actually…
if you want to start this kind of bussiness, you’d better excellent “guan xi”.