When I said Marvelous, I meant the game company. (Magical Pop'n was by Pack-in-Video and I believe Marvelous Entertainment was formed by a merger of them and Victor's game division.)

Though I do have Marvelous the game, which I had got for only like $5 CIB years ago. Which was a bit of a surprise since it was well-known but nobody was translating it which is probably why it hadn't gone up in value.
Is Accelebrid worth money now? That was also one I picked up a few years ago in the $10 CIB range.
Gun Hazard too. (from what I heard, Rudra no Hihou, their final game?, was the only Square SFC game that wasn't super-common in Japan)
(and Miracle Girls but mine is in pretty **** condition, so maybe that's why)