This pencil-shaped stylus for the Nintendo DS is achingly old skool-cool.
It is available in orange and green and is slightly larger than the standard stylus and works with your DS or DS Lite.
Although an official Nintendo product this is only available in Japan, so you'll have to make your purchase through a helpful overseas online retailer such as Brando (link below).
$10, plus a $3 shipping fee.
>> Link - to Brando.com.hk