This might be a stretch, but I have a Japanese exchange student working in our high school association for the spring. Since there seems to be all kinds of sites in Japan, I believe, would you want me to see if he could score a couple of pair of these for you. His parents were able to get his gear here within a weeks time when he joined. This kid, by the way, is 19 and can flat out umpire.
Umpstu - when you mentioned Japan, I remembered this site: http://www.go-stop-call.com/wilson_npb_mask.html
$50 plus shipping. If you don't want to go that way, at least that's proof that they exist in Japan and the person that @umpstu knows might be able to get a pair or two.