Hi, i bought the “Original Chuwi Hi 12 Hipen H1 Active Stylus Pen with 256 Level Mechanical Multi Function Buttons” at the Aliexpress site for U$24,00, and it´s working fine.
Sorry for the late reponse, the H3 pen of the Hi13 from chuwi doesn’t work with the cube iwork10 ultimate (at least not with the usb c version, I’ve tried, cause I’ve got both tablets and pens). You need either the original Cube active stylus CEP02 or the Hi1 pen which Sergio mentioned.