Is it possible to officially buy a BioNTech dose in Germany ?
And when it comes to ordering from the manufacturer, whether it's Pfizer or BioNTech, AFAIK nobody except nation states can do that. They just don't accept anyone else as customers - with very rare, but notable exceptions (there was this occurrence where the company TSMC ordered some millions of doses of Comirnaty as a proxy for the Taiwan government because some weird Chinese intervention, of which I didn't fully understand the exact mechanism how it worked, prevented Taiwan from ordering directly).