The below is from the htc blog post:
Viveport is celebrating the holidays early this year with our Black Friday deal beginning now!
Starting today, a one-year membership to Viveport Infinity, the unlimited VR subscription service, is on sale for USD$60 (or local equivalent), a 45% savings! This special deal runs through December 1, 2019, and is available for VIVE, Oculus Rift, Valve Index, and Windows Mixed Realty owners.
If you already have Infinity you can apply your 10% off (which you get one per month) on this and extend your membership.