Be carefull if you need a new stylus. I broke mine (Onyx Boox M92), and I am going crazy trying to find one. Booxter is helping a lot.
I tried Entourage Edge and Irex 1000 styluses and do not work. I have bought a Wacom penable PC slim pen at Amazon, and does not work.
But I tried with an Onyx Boox M90 pen and it worked (however Booxter tried and did not work). Now I am waiting for a new one from ereader-store.