That's all you have to do!
Even if you purchased a 3DS at a retailer who's already dropped the price, you qualify--again, so long as you hop into the eShop and say hello to Nintendo's digital marketplace.
Nintendo recently announced a substantial price drop for 3DS worldwide, spurred by disappointing sales of the handheld successor. In North America, the machine's going from $249.99 to $169.99.
"We are all too keenly aware that those of you who supported us by purchasing the 3DS in the beginning may feel betrayed and criticize this decision," said Iwata. "This unprecedented timing for a price cut is because the situation has changed greatly since we originally launched the 3DS. We decided it was necessary to take this drastic step in order to ensure that large numbers of users will continue to enjoy the 3DS in the future."