Well I purchased Metroid Prime 1&2 to play on a borrowed Wii, so there's at least 2 used gamecube games that are off the shelves. And once I get my own Wii, I intend to buy Wind Waker, Eternal Darkness and probably one or two other Cube games.

^When I got my Wii, I went ahead and purchased 20 GC games -now up to 30.
Most I found for under 15, but some Nintendo games just don't go down in price- Melee, Double Dash.

On average, I paid about $20 for all the games.

I got Pikmin 2 for $15 AUD when a gameshop was closing down... yay gotta finished the last part of that someday.

Funilly enough I had the same problem finding last-season GC titles here in Germany years before the Wii launched... I think I read somewhere that it is generally Nintendo's policy not to drop retail prices (at least for 1st party titles), and retailers appreciate that. Very much like Apple BTW, and not good for bargain hunters. Good for the casual shopper though.

I know that my local Sam's Club has a lot of Crappy GC titles with added stickers that say: "Compatible with Nintendo Wii"

You should pick them up sooner than later.  Gamecube games seem to be getting harder to find in stores.

Still have not found Pikmin2 or Mega Man collection, and I should have picked up Cubivore for $17 when I had the chance.

At my local Gamecrazy the opposite is happening, the selection of quality used GCN titles has exploded. I've always checked for GCN games I had missed like Battalion Wars, Mario Kart, Paper Mario everytime I went but they never had any decent GCN games. Now it seems like they have almost every great GCN game (I'm not sure about Pikmin, I don't care for it so I haven't looked for it). I got the 3 games I mentioned for $30 so I'm a happy camper.

Sadly, and somewhat off topic, they don't have many Dreamcast games anymore. They're all $2 so I was hoping to pick up a bunch but it was slim pickings.

There seems to be a lot of interest in the MegaMan collection. Don't worry, you'll get to download each game individually for $5 eventually.  I'm just glad I found it for like $9 I believe it was.

I was lucky; I bought Fire Emblem, Battalion Wars, Spartan (meh) and Mario Sunshine all for 60Euros :)

Thank you, backwards compatibility. I've had this problem with a few Xbox/GC games.

Just try to find Conker for Xbox in a Gamestop some time. I check three Gamestops regularly and only one had it about two months ago (none since then); unfortunately for me, my jackass of a friend saw it and nabbed it before I could buy the game.

the problem at gamestop is shelf space. sure, they might have a metric ton of gamecube games in a warehouse somewhere that are all priced $5.99 - 14.99 but they need to make room for the ton of Wii/DS/360/PS3/PC games that are being released, that have higher profit margins.