Here is a site that sells it in large-ish quantity
http://www.realmilkpaint.com/oil.html
From the site, their raw tung oil has no dryers or solvents, and unlike linseed oil, it will not mould, discolour, or crackle (it remains slightly elastic). I dislike the strong smell of linseed oil, and tung oil has zero vocs, is slightly nutty, and apparently not unpleasant. It can be applied indoors and outdoors on surfaces subject to the elements.
This is going to coat my earthen and wooden floors, and all of my built-in wooden furniture (and wooden dishes/boards).
I also like the
milk paint, though I may wait until I have a
chicken butcher and do the old-fashioned barn red made with milk and blood, for the out-buildings...
All in good time.