Sailor is releasing their shikiori inks in cartridges. Each package has 3 cartridges in it, with the name of the ink in English (or rather in Latin letters), so it's easy to know what ink is in it if you carry the cartridges loosely with you.
One package with 3 carts will cost 350 Yen + tax, so that gives an idea on price.
There will be a special/limited package available of all colours in a box.
See these instagram posts on packaging etc