As you know, Nintendo is releasing an adapter for Wii U that'll let you play Super Smash Bros. with four original Nintendo GameCube or WaveBird controllers. Now we have the price: $19.99.
The company will also sell "retro" GameCube controllers with Smash Bros. markings for $29.99, in case you don't have one or need more. Lastly, there's a $99.99 bundle planned -- it comes with the game for Wii U, the adapter, and one of these new controllers.
All of this will launch the same day as Smash Bros. on Wii U this holiday season.