There was a great deal going on for the 3DS at club.nintendo.com, and it is going to end very soon, here is the full page for the details: http://club2.nintendo.com/30/
The most important info though, is that if you have Fire Emblem Awakening, I suggest you go get SMT4 so you can get the 30$ credit, and vice-versa if you already have SMT4 and don't have FE:A. There's still time till 11:59 tonight! Hurry! Maybe you can still get the credit which will more than 75% pay off Pokemon X and Y when they come out in over a month!
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Or any other game on the 3DS if you don't like Pokemon, just hurry!