It is available on ebay in 23 litre batches by a selller called fermenters paradise.
https://www.ebay.co.uk/itm/267064640801?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=X59G8h1wTNC&sssrc=4429486&ssuid=X59G8h1wTNC&var=&widget_ver=artemis&media=COPY