The only complaint I had of the Zaurus was the cheap stylus for an otherwise perfect product. PDAir 3-in1 stylus was made as a replacement for the Z so fits perfectly and has a weighted, nylon tip for better grip and the nylon won't scratch the screen. It also doubles up as a pen (unscrew the base and it reveals a pen)
Same as shown here: http://www.pdair.com/sharp_c700_3in1.htm
Retails at Brando for $18 (incl. S&H). Will ship within the US for $10 + $2 (Shipping).