Got a loose volume 2 GBC cart for about $12 shipped. Thinking about tracking down the rest to play, and wondering about what I should expect to pay?
(if the GoodTools set is to be believed, the SGB versions were Japan-exclusive and the GBC versions were EU-exclusive?)

Seems almost worth it for Parodius alone (no US release). I assume "Block Game" is Quarth. I wonder if there's a chance I could play a link game with the US mono cart? Not expecting it to be likely, though.