Yamada's catalog says they support Europe from a satellite facility in The Netherlands, perhaps they can identify a local distributor.Oh thanks I was missing something !
The design of these cartridge seems quite interesting to avoid mess.
I think it would be worth mentioning in the original post that it's not using a standard cartridge.
I found the seller you mention on Ebay, actually that's the only seller I found on Internet for those Yamada MMG-80 cartridges. On Ebay he listed his posting for shipping to the US only (I can't even see it if I am in EU version of Ebay) and even if it would ship to the EU, international USPS rates are quite high compared to the value of grease... 36$ if 2 or 3 cartridge could fit in a double DVD bow, 72$ otherwise for a medium box....
Really bad to not be able to obtain this regular maintenance product in the EU :/
Actually I found that crazy, I can still find a modern Yamada KH-120 in a lot of places and shops but the cartridges that it uses are almost extinct.
More info on Yamada bellows.