Every so often Club Nintendo switches up its digital rewards, and today, you can grab the following -- Electroplankton (3DS), Kirby's Dream Land (3DS), Kirby's Adventure (Wii U), and Mario Party 2 (Wii/Wii U).
You can buy them for 150, 150, 200, and 250 coins respectively. Out of all these I heartily recommend both Kirby games, although odds are you've played them both already. Mario Party 2 is a surefire way to start up and ends some friendships though.
If these new games aren't showing up, click the "get rewards" section towards the top -- the home page hasn't been updated yet.
Digital Rewards [Club Nintendo]