I've never found any other major manufacturer of real lino than Forbo [although they only claim to have 65% of the market], a Swiss conglomerate, that bought out the "descendant" of the originator of plant based lino - [Wiki: "
The largest present day manufacturer of linoleum is Kirkcaldy-based Forbo Nairn, which sells the material under the trademarked name of Marmoleum. The company, which is part of the Switzerland-based Forbo Group, is the oldest manufacturer of linoleum in the world."], and they have plants all over the world, the German Forbo
Siegling Group makes conveyor belting .... my local flooring store can get Forbo's products readily, I'd suspect there's a plant in N America
when I first built my mill 30 years ago I used battleship lino locally sourced, it lasted pretty well but didn't like very heavy objects dropped on it

when I checked the price to replace it after about 15-20 years I decided to switch to fiberglas
Bill