I've been playing lots of GameCube games on my Wii, mostly Animal Crossing and Super Smash Bros. Melee in particular. I also managed to get some new GC games such as GUN, Killer7 and Chibi-Robo. I realized that I was running low on space, so I decided to walk to the Wal-Mart near my house and buy a new one, or at least buy one of the third-party memory cards to save a few bucks.
I walked around the Wii area and the small GameCube area and I couldn't find a single memory card, official or unofficial. They still had their PlayStation 2 stuff since it's not actually dead yet. After a few minutes of wandering aimlessly, I decided to ask one of the Wal-Mart employees.
He looked me in the eyes and said, "We don't have them anymore!" I was boggled, they still sell their GameCubes at $70, and their GameCube games, but they have no memory cards or controllers!
When I inserted my memory card into my Wii for the first time, I assumed that it could use its own storage space and having an actual card is optional, but I was wrong. So usually, I leave the card in its side port in case I ever feel like playing a GC game. It was a slap in the face when Wal-Mart stopped selling the GC memory cards and continued selling the consoles and the games themselves.
I even went to Nintendo.com to order one directly, but their store page is gone. So if I really wanted a GC memory card, I'd either have to go to a used-game store or eBay.
It just boggles me though. If a kid buys a GameCube game, they might forget about the controller or the memory card entirely, and they'll feel ripped off after realizing that they can't be easily bought anymore. The only game that actually comes with a memory card is Animal Crossing (low capacity), but I bought a cheap used copy, so I never got that card. It wouldn't have made a difference, because that card is only enough to save one game, Animal Crossing! I understand that the GameCube has been replaced by the Wii, but how can they still sell the GameCube games while discontinuing the sales of controllers and memory cards? My guess is that Nintendo decided to discontinue them and Wal-Mart decided to sell them all away without restocking, which is why they only have only GameCubes and GameCube games left. The controllers sold out as a result of Smash Bros. proclaiming that the "GameCube controller is the best way to play" since the Wii Remote and Nunchuk don't make extensive use of the motion sensors.
So, I guess that's it for GameCube Memory cards. I don't desperately need one now; I just wanted one as a backup. There's also a GameCube SD Card adapter that uses SD Cards like memory cards, so I might get my hands on that if things get desperate.