Prices on gamecube games???

I just got a nintendo wii and decided to sell some of my old gamecube games to get some more extra money. I have either beaten, lost intrest in, or bought a sequeal to all the games i am planning on selling. I was wondering if any one knows how much these games are worth, super smash bros melee, nba live 2004, F Zero GX,NFL 2K3, Teenage Mutant Ninja Turtles, Metroid Prime, The Incredibles, Spider man 2,Harvest Moon Another Wonderful Life, and Megaman Network transmission. All help is appreciated thanks. =)