Hi why the "Resident Evil Code:Veronica X" it's so expensive now?

Hi I play Wii & Gamecube games on my Wii. I am also a Resident Evil fan too. Ok I was thinking buying "Resident Evil Code:Veronica X" on ebay & Amazon. On ebay, they go for $26-$46. At Amazon, they go for $35-$50. Why the heck is so expensive? And the other Gamecube games like "Resident Evil the remake & "Resident Evil Zero" they both go for less then $20?