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These discs are industry grade discs, so you won't probably find them in consumer shops. I bought them from "pdoeurope" in Wiesbaden, Germany, in 2017. The product number was "ASBS25RDJP" (Media ID VAMKM-IMf). They were very expensive, about 13 Euros one piece. They also had 100GB discs with MID VAMKM-IMk. I didn't buy them, they were 30 Euros a piece.
I could burn these 50GB discs only with Pioneer's PR1MC, that I directly bought from Almedio, Japan. As of about 2024, Almedio ceased the distribution of archival grade optical BD-R drives. The consumer Pioneer's weren't able to burn them, since the firmware doesn't have a write strategy for VAMKM-IMf. I found out that Plextors PX-B940SA firmware contains a write strategy for those discs. (B940SA is a relabeled Pioneer drive, BDR205)
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