Amazon.com: Rechargeable USI 2.0 Pen for Lenovo Chromebook, 4096 Grade Pressure for Lenovo Chromebook Duet Duet 5 / IdeaPad Duet 5 / IdeaPad Flex 5i, for Lenovo Yoga with Palm Rejection, Spare
Active stylus Pen GX80U45010 Lenovo Digital Pen For Lenovo Yoga Duet 13" Thinkpad P53 L13yoga X13 Yoga - AliExpress
Amazon.com: BoxWave Stylus Pen Compatible with Lenovo IdeaPad Chromebook Duet 3 (11 in - 82T6) - AccuPoint Active Stylus, Electronic Stylus with Ultra Fine Tip - Metallic Silver : Cell Phones & Accessories
Lenovo USI Pen 2 - Digital pen - works with chromebook - gray - retail - for IdeaPad Duet 3 11Q727 82T6; 3 Chromebook 11Q727 82T6; ThinkCentre M75t Gen 2 11W5 - Walmart.com
Amazon.com: Active Stylus Pen for Lenovo Duet Convertible 2-in-1 Chromebook 11.6",Type-C Charge High Precision with Fine Tip Universal Stylus Pens Compatible with Lenovo Duet Chromebook,Good for Drawing,White : Cell Phones & Accessories
Original Lenovo E-Color Pen For Yoga Duet 7i (13”) 2 in 1 and Yoga Duet 7 laptop Bluetooth rechargeable stylus - AliExpress
Amazon.com: Pencil Stylus for Lenovo Chromebook Duet 3/5 Pen,Minilabo Touch Screens Active Stylus Digital Pen with 1.5mm Ultra Fine Tip Stylist Pen for Lenovo Chromebook Duet 3/5 Drawing and Writing Pencil,Pink :
Touch Pen Lenovo IdeaPad Duet Chromebook Display Entry Pen Rubber Tip Black | eBay
For $38, you can buy the USI stylus designed for the Lenovo Chromebook Duet