smac on 25 August 2009
GBC: Pokemon Gold (Sealed)
GBA: Pokemon Emerald, Zelda: Minish Cap
GC: Phantasy Star Online, Skies of Arcadia, Ikaruga, Metal Gear Solid: Twin Snakes, Pikmin 2 (All pretty rare)
PS2: Marvel Vs Capcom 2
XBOX: Halo Triple Pack, Shuemue II
DC: Sonic Adventure 2
That site also lists Pokemon Box as the most expensive gamecube game, I got it but can only assume it's much more common in the PAL region.
