I saw this on Costco's website and thought it might be of use to someone.
Costco has an unlocked Microsoft Surface Duo Phone 256GB with a bonus Microsoft 365 Family 15-Month Subscription for $499.97. The price is valid through September 1. It also comes with a 2nd Year Warranty, free technical support, and a 90-day return policy.
I've seen the Duo on sale at Best Buy for $699.99 without the Microsoft 365 subscription.