Unfortunately, there's no Best Buy in NZ...I think. The part I live in has only got two decent game stores: EB Games and a Harvey Norman store (no DS games :-( ))
It looks like I have to order, but I might just get the WFC USB thing, seeing it will connect my DS to the internet.
And no, we are not getting started on the Wireless Sensor Bar! You can nag in the other one, "What Wii Accesory should I get?