I have tracked offers on Microsoft Office (now Microsoft 365) subscriptions for several years, and this is the best offer that I have seen on the "family" version (6 people). It is $ 59.99 per year, with subscription through Amazon. This part is key: the implication on the Amazon page (top, right column, under "Add to Cart") is that the renewal price stays the same each year:
"Your subscription continues until cancelled. If you do not wish to continue for $ 59.99/year plus any applicable taxes, you may cancel anytime by visiting your Digital Software Subscription Asset Manager from Your Memberships & Subscriptions under Your Account."