No commercial production.
Meitnerium has no commercial supply chain. Every known atom has been created in accelerator experiments, beginning with GSI Darmstadt's 1982 synthesis of element 109 from bismuth and iron. IUPAC/IUPAP later recognized the discovery claim in the 1993 Transfermium Working Group report, and the name "meitnerium" was then adopted in the later transfermium naming settlement.
The element's practical reality is nuclear-physics research, not materials commerce. NNDC's ENSDF/NuDat record identifies Mt-278 as the longest-lived confirmed isotope at 4.5 seconds, still far too short-lived for bulk chemistry or trade. Contemporary work is confined to a handful of specialist accelerator centers such as GSI and JINR that can produce superheavy nuclei and observe meitnerium isotopes directly or in decay chains from heavier elements.