Same as so many things - they're only made for the US and only available there. I think these are exclusive to RG It makes me SO cross that we can't just buy stuff in Europe, but it would seem we're too small to be worth bothering with.

Mixed packs: http://www.riogrande.com/Product/Las...r/110314?Pos=3 and
http://www.riogrande.com/Product/Las...t/110327?Pos=2

I also bought extra 8/0 and 6/0 as these are my most used blades. I'll get more in other sizes when I've blunted all my existing stock, which probably won't take long! I haven't tried the heavier blades on steel yet, but from what I hear, they're a viable alternative to platinum king.