Hello,
I'm on the market for sayas for a bunch of knives. Do you guys know a website or someone that makes them in europe? I can't seem to find anything on the forum outside of the US.
Please make sure what is the purpose you have in mind. A traditional saya is useful for transport, not for storage. When storing a carbon steel blade you want a medium that balances hygrometric changes to avoid rust.
Make your own with cardboard and duckt tape. Where I live some heavy hygrometric and temperature changes are likely to occur when the blade's are stored in a backpack during winter time. I believe that isn't the case in Japan, so sayas can make sense, there. Cardboard is cheap and safe.