It used to be easier to find in the US as well. For a while, one of the big hardware store chains carried both the Norton Economy 6" oil stone and the 4.5 oz Norton Honing Oil at about $6 and $5 each, respectively. I picked up two of each at the time. Somewhere along the line, they stopped carrying both, though I can still find the oil at one on-line dealer. I am still working my way through those two, but I tend to reserve the sharpening stone oil for knives and use other mineral oils for sharpening.
Seems like a common occurrence in recent years where products and brands that you took for granted would always be available just disappear. One reason to stock up while you can still get things, especially things that are a particularly good value for your money. Those are the ones that are more likely to vanish. Or maybe it's just because I am old enough now to where things I consider to be "recent memory" happened 20 years ago.