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If you head on over to PokémonCenter.com you'll notice they've added two new products to their hardware lists - Nintendo PokéPark DS and a Pikachu GBA Micro.

You may recognize these two handhelds from previous news posts, because both of these have indeed been available in Japan for quite a while now. However thanks to the crew at PokémonCenter.com (not the evil Pokémon.com) they have been localized for the US and are now both exclusive to the online Pokémon market.
(Wal-Mart did carry the PokéPark DS at one point, but apparently no longer does.)