I just saw a study today saying it could be stored at regular freezer temperatures. And that only one dose of the Pfizer is necessary.
The study data suggests that one dose is nearly as effective as two, but not quite. The polio vaccine is 90% effective after two doses, 99% effective after 3, and in the US we don't consider you fully vaccinated until you've received 4.
The Moderna vaccine has been shown to be about 82% effective after one dose. But why settle for 82% when you can have 95%? I'd take a third dose if it got me closer to 100%.
-5 to -12 F "is" regular freezer temperature.