Heh, here in NZ, it's hard enough to find GameCube games, let alone rare GC games, even more letter aloner, rare GC games cheap.
I managed to find a new copy of RE3 for GC (PAL) for NZ$30, about 25% of the price the game was going for new.
Still haven't played it, though. Can't bring myself to make such a huge backwards graphical leap for a game that was reported to be mediocre at best.