… in a manner of speaking.
The Wii U’s Gamecube adapter, which Nintendo released specifically to allow players to use the Gamecube controller with the Wii U to control Super Smash Bros. for Wii U, has been a bit of a mess in North America, as far as retail availability goes. The adapter, which retailed for a price of just $20 initially (and was also part of a $100 bundle with Super Smash Bros. for Wii U), was sold out early at launch (naturally), and… it never came back in stock.
Prices continued to inflate at a startling rate online, as the scarcity of supply for the peripheral became more and more apparent, but it appears that the situation may finally be remedied… somewhat.
Gamestop has confirmed that it has the Gamecube adapter bundle back in stock… but only the bundle. What does this mean? This means that while, yes, it is theoretically possible for you to finally get your hands on the Gamecube controller adapter, you also need to buy a copy of Super Smash Bros. with it, as only the bundle is being made available.
Yikes. At least you can sell the copy to cover the costs, I guess?