I dunno how things stand with the iLiad, but on my DR800, I found I could use the stylus from my Toshiba TabletPC (this one :
http://www.amazon.com/Digital-Stylus.../dp/B000F6OJHE). Wacom touch screens seem to equip many Tablets, so you could perhaps find a TabletPC replacement stylus that'd work fine on your iLiad.
Good luck !
EDIT : indeed, the stylus Marcins linked to is a Toshiba reserve ("emergency") stylus, also sold on Amazon but for more :
http://www.amazon.com/Toshiba-Tablet...669672&sr=1-11