Before mixing, the vaccine may be stored in an ultra-cold freezer between -80°C and -60°C (-112°F and -76°F). Vaccine may be stored until the expiration date.
Before mixing, the vaccine may be stored in the freezer between -25°C and -15°C (-13°F to 5°F) for up to 2 weeks. The total time vials are stored at these temperatures should be tracked and should not exceed 2 weeks.
So once they reach their destination they can be put in a normal freezer, which in turn are abundant and cheap.
It's not a negligible cost but it's far from highly specialized.
I had Astra, so did several people from my social circle. Hell, some took JJ being aware of its level of effectiveness.
The vaccines need to be stored at a low temperature - that's it. I doubt it adds more than €1 to the price.
The cost of Pfizer is a lot more than the per shot cost, you need highly specialised storage and distribution due to the low temperature requirements.