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For those that have devices that only use physical SIM cards, be aware that obtaining a replacement is difficult. You cannot find them at local retailers anymore. Google Fi support will tell you that you can purchase them at Best Buy, Target, Walmart stores; or Amazon. All of their websites are either sold out or do not show that the cards are available either.
Ordering direct from Google Fi can take a week or more and tracking details are limited.
Good Luck!
How the heck are you supposed to order a new SIM on mobile? In the app if I go to shop it just gives me a limited list of devices to buy. If I go to the website in Chrome and tap "sign in" it just opens the shop tab in the Fi app. As far as I can tell there is no way to order a new SIM on mobile.