the NDS Lite Stylus is too fat to fit in the Holder, and the Old DS stylus is crap and the size of a tooth pick, so lets not eve talk about that.
I own this
http://www.dealextreme.com/details.dx/sku.849
you can also get these
http://www.dealextreme.com/details.dx/sku.14233
http://www.dealextreme.com/details.dx/sku.16531
http://www.dealextreme.com/details.dx/sku.16529
http://www.dealextreme.com/details.dx/sku.16532
Or search around, Great Site, 3 week+ Shipping though