We used it about 10 years ago, from Laboratories CCD, Paris, France. I have found the following providers:
...Menezo's B2 medium (Meditech Canada Inc., Montreal, QC, Canada)...
...Menezo's B2 medium (MB2; Pharmascience, Paris, France)...
...Menezo B2 medium (Sevapharma, Prague, Czech Republic)...
When click in the web pages, there is no good information about if they sell this medium or not at present.