Just bought This pen for myself.
Coupon code works.
Overview
The Lenovo USI Pen is great for extended notetaking and writing, fine art or graphic design. The pen with its USI protocol supports Chrome OS and provides an industry-leading 4096 levels of pressure sensitivity for natural writing and sketching, along with a 150 days battery life based on 2 hours in active use daily
Review looks good too
Good deal. It's $41.30 on Lenovo Education. Works quite well on Flex 5i Chromebook.