Basically, the problem is that the system was never popular in the USA, so getting a full system is going to require at least one rare component. The Duo is rare, the US 3.0 card is rare, and converters are rare. CDs are more common than I thought but I don't know if they could be called common. The simplest way to play everything is to buy an American TG-16 system and a Japanese Duo, which is absurd but true. It may help if there's someone here who can do a region mod or a homemade converter.
And ignore the people telling you to get a Laseractive or Supergrafx.